Liquid circulation apparatus

Abstract

To desirably discharge the battery of a mobile body.SOLUTION: A liquid circulation apparatus includes: a supply route for supplying a discharge processing liquid into a battery of a mobile body; a circulation route including a recovery route for collecting the supplied discharge processing liquid; a pump for circulating the discharge processing liquid into the circulation route; cooling means for cooling the discharge processing liquid flowing in the circulation route; and control means for controlling the pump and the cooling means and supplying the discharge processing liquid of a predetermined temperature to the battery.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a liquid circulation device. [Background technology]

[0002] When a mobile object such as a multicopter that uses a battery as an energy source detects some abnormality in its own aircraft during flight, it makes an emergency landing, for example, at the nearest port. A port that accepts an emergency landing is equipped with fire extinguishing equipment in preparation for a battery fire (for example, see Patent Document 1).

[0003] Even after a battery fire has been extinguished, there is a risk of re-ignition if electricity remains in the battery. For this reason, it is desirable for ports where vehicles can make emergency landings to be equipped with equipment to properly discharge batteries. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2022-066797 A Summary of the Invention [Problem to be solved by the invention]

[0005] An object of the present invention is to provide an apparatus for appropriately discharging a battery in a mobile unit. [Means for solving the problem]

[0006] In order to achieve the above object, one embodiment of the present invention is a liquid circulation device, comprising: a supply path for supplying a discharge treatment liquid to a battery of a mobile body, and a circulation path including a recovery path for recovering the supplied discharge treatment liquid; a pump that circulates the discharge treatment solution through the circulation path; A cooling means for cooling the discharge treatment liquid flowing through the circulation path; a control means for controlling the pump and the cooling means to supply the discharge treatment liquid at a predetermined temperature to the battery; Equipped with. Effect of the Invention

[0007] According to the present invention, a pump for circulating the discharge treatment liquid through the circulation path and a concentration adjustment means for adjusting the concentration of the discharge treatment liquid flowing through the circulation path are controlled based on the flow rate and concentration of the discharge treatment liquid flowing through the circulation path. This makes it possible to supply a discharge treatment liquid whose temperature and concentration are appropriately adjusted to the battery of the mobile body. Therefore, the battery of the mobile body can be appropriately discharged. [Brief description of the drawings]

[0008] [Figure 1] FIG. 2 is a diagram showing the configuration of an emergency landing port according to the embodiment. [Diagram 2] FIG. 2 is a plan view of an emergency landing port according to an embodiment. [Diagram 3] 2 is a block diagram showing a schematic control configuration of the emergency landing port according to the embodiment. FIG. [Figure 4] 10 is a flowchart showing the flow of the discharge process of an unmanned aerial vehicle by an emergency landing port according to an embodiment. [Diagram 5] 13 is a diagram to explain the discharge process when an operator can approach the unmanned aerial vehicle. [Figure 6] 13 is a diagram for explaining the discharge process when an operator cannot approach the unmanned aerial vehicle. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

[0010] [Emergency landing port configuration] FIG. 1 is a diagram showing the configuration of an emergency landing port 1 according to this embodiment, and FIG. 1 and 2, the emergency landing port 1 according to this embodiment is a landing site where an unmanned aerial vehicle (hereinafter simply referred to as "unmanned vehicle") 100 makes an emergency landing when it detects an abnormality in the vehicle. The emergency landing port 1 is an example of a liquid circulation device according to the present invention.

[0011] The drone 100 is, for example, a multicopter capable of flight including vertical takeoff and landing using a plurality of rotors (propellers) 121. Specifically, the drone 100 includes a main body 120 and a plurality of rotors 121. The multiple rotary blade portions 121 are provided at the tips of multiple arm portions 122 extending from the main body portion 120 in all directions. The main body 120 is formed in a rectangular box shape, and includes a battery 130 that supplies power to each part of the drone 100. The battery 130 is housed in a battery mounting shelf 132, for example, in a detachable manner. The main body 120 is provided with a receptacle 124 to which a connector (receptacle) 35 described below is connected. The receptacle 124 is exposed, for example, on the lower surface of the main body 120, and is configured so that the connector 35 can be attached and detached from the outside.

[0012] The emergency landing port 1 is equipped with a landing pad 20, which is a landing site for the unmanned vehicle 100, and a circulation unit 30 that circulates a discharge treatment liquid that discharges the battery 130 of the unmanned vehicle 100 between the unmanned vehicle 100 and the landing pad 20, which is a landing site for the unmanned vehicle 100.

[0013] The landing pad 20 is formed in a square recessed shape in a plan view, and has a bottom portion 20a and a wall portion 20b. The landing pad 20 is made of, for example, a fire-resistant material. A circular landing point 20c is located on the bottom 20a of the landing pad 20 to indicate the landing location for the unmanned aerial vehicle 100. On the inside of the landing platform 20, along the inner surface of each wall portion 20b, a step platform 20d for workers to climb up and down is arranged. Furthermore, since the landing pad 20 may be damaged in an emergency landing of the unmanned aerial vehicle 100, it is preferable that the landing pad 20 has a structure that is easy to replace, such as an assembly type.

[0014] As described below, the landing pad 20 also functions as a reservoir for a discharge treatment liquid that discharges the battery 130. Therefore, the height of the wall portion 20b is set to a height that can store a discharge treatment liquid to a depth that submerges the battery 130 of the unmanned vehicle 100 when the unmanned vehicle 100 lands on the bottom portion 20a. In other words, the height of the wall portion 20b is higher than the position of the battery 130 of the unmanned vehicle 100 that has landed on the bottom portion 20a.

[0015] An equipment unit 25 including various devices for supporting the drone 100 making an emergency landing is provided on the landing pad 20. The equipment unit 25 is installed, for example, on the upper part of the wall portion 20b, although this is not particularly limited. The equipment unit 25 of this embodiment includes a guidance device 26 , a fire extinguishing agent outlet 27 , various sensors 28 , and an inert gas outlet 29 .

[0016] The guidance device 26 guides the drone 100 to the landing point 20c during the landing operation. The guidance device 26 includes, for example, a guidance radar (or a light emitting unit) for guiding the drone 100, a communication unit for transmitting position information of the emergency landing port 1, and the like. The extinguishing agent outlet 27 is connected to a tank or cylinder of extinguishing agent and releases extinguishing agent onto the drone 100 that has landed at the landing point 20c. The various sensors 28 include various sensors that remotely (non-contactly) observe the state of the unmanned aerial vehicle 100. The various sensors 28 include, for example, a temperature sensor, a gas detector, a voltmeter, etc. The various sensors 28 may also include an anemometer for supporting the landing operation of the unmanned aerial vehicle 100. The inert gas outlet 29 is connected to an inert gas tank or cylinder and releases the inert gas to the drone 100 that has landed on the landing point 20c. The inert gas prevents the gas generated by the discharge process of the battery 130 from igniting.

[0017] [Circulation unit configuration] The circulation unit 30 circulates a discharge treatment liquid to discharge the battery 130 to the unmanned aerial vehicle 100 that has landed on the landing pad 20.

[0018] The discharge treatment liquid circulated by the circulation unit 30 is not particularly limited as long as it promotes the discharge of the battery 130 (battery cell). For example, the discharge treatment liquid is a sodium chloride aqueous solution (e.g., salt water) of a predetermined concentration, water, an anionic surfactant as described in Japanese Patent No. 6847716, an aqueous solution of a weakly acidic alkali metal salt as described in Japanese Patent Laid-Open No. 2005-347162, or the like.

[0019] Specifically, the circulation unit 30 includes a circulation path 31 for the discharge treatment liquid. The circulation path 31 includes two systems: a first circulation path 31a and a second circulation path 31b. Each of the first circulation path 31a and the second circulation path 31b includes a supply path 32 that supplies the discharge treatment liquid to the drone 100 and a recovery path 33 that recovers the supplied discharge treatment liquid. The first circulation path 31a includes a first supply path 32a and a first recovery path 33a. The second circulation path 31b includes a second supply path 32b and a second recovery path 33b.

[0020] The first supply path 32a and the first return path 33a have their ends on the drone 100 side connected to a connector 35. The connector 35 is configured to be detachable from a socket 124 of the drone 100. When the connector 35 is not connected to the socket 124, the first supply path 32a and the first return path 33a are blocked within the connector 35. On the other hand, when the connector 35 is connected to the socket 124, the first supply path 32a and the first return path 33a communicate with the inside of the battery 130 (or the inside of the battery mounting shelf 132) through the socket 124. Further, an exhaust device 49 is connected to the connector 35 via an exhaust path 36. The exhaust device 49 sucks in and safely collects gas generated from the battery 130 during the discharging process.

[0021] The second supply passage 32b has an outlet 37 at the tip on the drone 100 side that opens on the inner surface of the wall portion 20b of the landing pad 20. In this embodiment, the downstream portion of the second supply passage 32b branches into multiple outlets midway (e.g., at a valve 47 described below), and the multiple outlets 37 are arranged approximately evenly around the entire circumference of the wall portion 20b. The second recovery path 33b has an intake port 38 at the tip on the drone 100 side that opens into the bottom 20a of the landing pad 20. In this embodiment, the second recovery path 33b branches into four midway, and the four intake ports 38 open into the four corners of the bottom 20a in a plan view. That is, in the second circulation path 31b, the discharge port 37 of the second supply path 32b and the intake port 38 of the second recovery path 33b are in communication with each other via the internal space of the landing platform 20.

[0022] The first supply path 32a and the second supply path 32b share a part on the upstream side and branch off on the downstream side from the valve 47. The valve 47 switches the supply of the discharge treatment liquid to the first supply path 32a, the second supply path 32b, or both.

[0023] A pump 41, a concentration adjuster 42, a cooler 43, a filter 44, a first measuring unit 45, and a second measuring unit 46 are arranged in the circulation path 31. These are housed integrally in the enclosure 40 of the circulation unit 30, for example. In this embodiment, the starting point of the supply path 32 (the end point of the recovery path 33) is conveniently set to the filter 44. However, the starting point of the supply path 32 (the end point of the recovery path 33) is not particularly limited as long as it is a portion where the supply path 32 or the recovery path 33 is not branched into the first and second paths, and may be, for example, the pump 41.

[0024] The pump 41 circulates the discharge treatment liquid through the circulation path 31 . The concentration adjusting device 42 adjusts the concentration of the discharge treatment liquid flowing through the circulation path 31. The concentration adjusting device 42 also serves as a buffer tank for the circulation path 31. The cooler 43 cools the discharge treatment liquid flowing through the circulation path 31. A bypass path having a bypass valve is provided in parallel with the cooler 43. The filter 44 removes contaminants from the discharge treatment liquid after the discharge treatment in the battery 130. The filter 44 is individually connected to the first recovery path 33a and the second recovery path 33b. Each of the first measurement unit 45 and the second measurement unit 46 includes a flow meter and a temperature meter.

[0025] The pump 41, the concentration adjuster 42, and the cooler 43 are disposed in this order from the downstream side in the unbranched upstream portion of the supply path 32. The first measurement unit 45 is disposed in the first supply path 32a downstream of the valve 47. The first measurement unit 45 measures the flow rate and temperature of the discharge treatment liquid flowing through the first supply path 32a toward the connector . The second measuring unit 46 is disposed in the first recovery path 33a. The second measuring unit 46 measures the flow rate and temperature of the discharge treatment liquid flowing through the first recovery path 33a.

[0026] FIG. 3 is a block diagram showing a schematic control configuration of the emergency landing port 1. As shown in FIG. As shown in this figure, the emergency landing port 1 includes an operation unit 51, a display unit 52, and a control unit 57 in addition to the above-mentioned components. The operation unit 51 is an operation means by which an operator (user) performs various operations. The operation unit 51 includes, for example, various buttons and the like, and outputs an operation signal to the control unit 57 according to the operation content. The display unit 52 is, for example, a liquid crystal display or the like, and displays various information based on a display signal input from the control unit 57. The display unit 52 may be a touch panel that also serves as part of the operation unit 51, or may include a speaker capable of audio display (output). The control unit 57 is configured with, for example, a CPU (Central Processing Unit) and controls the operation of each part of the emergency landing port 1. For example, the control unit 57 loads a program stored in advance in a storage unit (not shown) based on the operation content of the operation unit 51, and executes various processes in cooperation with the loaded program.

[0027] [Discharging drones at emergency landing ports] Next, the discharge process of the unmanned vehicle 100 performed at the emergency landing port 1 will be described. Fig. 4 is a flowchart showing the flow of the discharge process. Fig. 5 is a diagram for explaining the discharge process when the operator can approach the unmanned vehicle 100, and Fig. 6 is a diagram for explaining the discharge process when the operator cannot approach the unmanned vehicle 100.

[0028] The emergency landing port 1 makes an emergency landing of an unmanned aerial vehicle 100 that has experienced abnormal heating of a battery 130 during flight, and performs a discharge process on the battery 130. Here, it is assumed that the unmanned aerial vehicle 100 has already landed at the landing point 20c of the landing pad 20. When the unmanned aerial vehicle 100 lands, the landing of the unmanned aerial vehicle 100 may be assisted by a guidance device 26 or the like.

[0029] As shown in FIG. 4, first, an operator determines whether or not it is safe to approach the landed unmanned aerial vehicle 100 (step S1). Here, the worker, for example, visually checks for smoke or fire and determines whether or not it is possible to approach the unmanned vehicle 100. Alternatively, the detection values ​​of various sensors 28 (for example, a temperature sensor, etc.) of the equipment unit 25 may be used as the basis for the determination.

[0030] <When workers can approach the drone> In step S1, if it is determined that it is safe to approach the unmanned vehicle 100 (step S1; Yes), the worker attaches the connector 35 of the circulation unit 30 to the socket 124 of the unmanned vehicle 100 (step S2).

[0031] Next, the worker operates the operation unit 51, for example, to operate the circulation unit 30, and circulates the discharge treatment liquid through the first circulation path 31a (step S3). 5, the discharge treatment liquid in the concentration adjusting device 42, which also serves as a tank, is supplied to the battery 130 (or the battery mounting shelf 132) through the first supply path 32a by the pump 41. The discharge treatment liquid cools the battery 130 and starts discharging. The discharge treatment liquid supplied to the battery 130 is collected in the filter 44 through the first collection path 33a connected to the connector 35, and contaminants are removed. This discharge treatment liquid passes through a cooler 43 (or a bypass path 34) and a concentration adjustment device 42, and is then supplied again to the battery 130 by the pump 41.

[0032] When the circulation of the discharge treatment liquid in the first circulation path 31a starts, the control unit 57 controls the temperature, flow rate, and concentration of the discharge treatment liquid (step S4). Specifically, the control unit 57 measures the temperatures of the discharge treatment liquid flowing through the first supply path 32a and the first recovery path 33a, respectively, using the first measuring unit 45 and the second measuring unit 46. Then, based on temperature information of the discharge treatment liquid before and after the battery 130, the control unit 57 controls the operation of the cooler 43 and the bypass valve 48 to manage the temperature of the circulating discharge treatment liquid. This allows the discharge treatment liquid supplied to the battery 130, for example, to be kept at or below a predetermined temperature. Note that instead of the thermometers of the first measuring unit 45 and the second measuring unit 46, a thermometer provided in the cooler 43 may be used. Furthermore, the control unit 57 adjusts the concentration of the discharge-treated liquid using the concentration adjustment device 42. When the discharge-treated liquid is, for example, a sodium chloride aqueous solution (brine), the concentration is diluted by electrolysis, so the concentration is adjusted to compensate for this. Furthermore, the control unit 57 measures the flow rate of the discharge treatment liquid flowing through each of the first supply path 32a and the first recovery path 33a using the first measuring unit 45 and the second measuring unit 46. Then, the control unit 57 controls the operation of the pump 41 based on the flow rate information (flow rate difference) of the discharge treatment liquid before and after the battery 130, and adjusts the flow rate of the discharge treatment liquid supplied to the battery 130. In other words, the flow rate difference of the discharge treatment liquid before and after the battery 130 means leakage of the discharge treatment liquid from the case of the battery 130 (or the battery mounting shelf 132). Therefore, the control unit 57 adjusts the flow rate of the discharge treatment liquid supplied to the battery 130 according to the flow rate difference of the discharge treatment liquid before and after the battery 130, for example by increasing the supply flow rate when there is a large leakage. Furthermore, here, the control unit 57 operates the exhaust device 49 to safely collect the gas generated by the discharge of the battery 130 through the exhaust path 36.

[0033] Next, the control unit 57 determines whether the temperature of the discharge treatment liquid has stabilized at or below a predetermined temperature (step S5). The temperature of the discharge treatment liquid is measured using a value detected by a thermometer provided in the cooler 43, or a thermometer of the first measuring unit 45 or the second measuring unit 46. When the discharge treatment liquid has been kept at or below a predetermined temperature for a predetermined period of time or longer, the control unit 57 determines that the temperature of the discharge treatment liquid has stabilized at or below a predetermined temperature. Here, the predetermined temperature is, for example, a temperature at which it can be determined that there is a sufficiently low risk of re-ignition of the battery 130. Then, if it is determined that the temperature of the discharge treatment liquid is not stable below the specified temperature (step S5; No), the control unit 57 transitions to the above-mentioned step S4 and continues to control the temperature, flow rate, and concentration of the discharge treatment liquid.

[0034] On the other hand, if it is determined in step S5 that the temperature of the discharge treatment liquid has stabilized at or below the predetermined temperature (step S5; Yes), the control unit 57 stops the circulation of the discharge treatment liquid (step S6) and ends the discharge treatment.

[0035] <When workers cannot approach the drone> In the above-mentioned step S1, if it is determined that the operator cannot safely approach the unmanned aerial vehicle 100, for example because the main body 120 has emitted smoke or caught fire (step S1; No), the operator activates the fire extinguishing equipment of the equipment unit 25 (step S12). Then, extinguishing agent is discharged from extinguishing agent discharge port 27 of equipment unit 25 toward unmanned aerial vehicle 100 that has landed on landing point 20c. At this time, various sensors 28 of equipment unit 25 detect the temperature, etc. of unmanned aerial vehicle 100 that has landed on landing point 20c.

[0036] Next, the worker operates the operation unit 51, for example, to operate the circulation unit 30, and circulates the discharge treatment liquid through the second circulation path 31b (step S13). At this time, if it is determined that the smoke or fire from drone 100 has stopped and the temperature has dropped sufficiently, making it unlikely that re-ignition will occur, the discharge process may be terminated. In other words, if the operator determines that the smoke or fire has not subsided or that there is a risk of re-ignition, step S13 may be executed.

[0037] 6, the discharge treatment liquid in the concentration adjustment device 42, which also serves as a tank, is discharged by the pump 41 through the second supply path 32b and the discharge port 37 into the inside of the landing pad 20. This discharge treatment liquid is stored in the concave landing pad 20, and the battery 130 of the unmanned vehicle 100 is submerged (step S14). This cools the battery 130 and starts discharging. The discharge-treated liquid stored inside the landing pad 20 is sucked in from the suction port 38 and collected in the filter 44 through the second collection line 33b, where contaminants are removed. This discharge-treated liquid passes through a cooler 43 (or a bypass line 34) and a concentration adjustment device 42, and is then supplied again into the landing pad 20 by the pump 41.

[0038] When the circulation of the discharge treatment liquid in the second circulation path 31b starts, the control unit 57 controls the temperature and concentration of the discharge treatment liquid (step S15). Specifically, the control unit 57 measures the temperature of the discharge treatment liquid in the cooler 43, for example, using a thermometer provided in the cooler 43. Then, based on the measured temperature information of the discharge treatment liquid, the control unit 57 controls the operation of the cooler 43 and the bypass valve 48 to manage the temperature of the circulating discharge treatment liquid. As a result, the discharge treatment liquid supplied to, for example, the battery 130 is kept at or below a predetermined temperature. Furthermore, the control unit 57 adjusts the concentration of the discharge-treated liquid using the concentration adjustment device 42. When the discharge-treated liquid is, for example, a sodium chloride aqueous solution (brine), the concentration is diluted by electrolysis, so the concentration is adjusted to compensate for this. Furthermore, here, the control unit 57 releases inert gas from the inert gas release port 29 of the equipment unit 25 toward the unmanned vehicle 100. This prevents the occurrence of ignition due to gas generated by the discharge of the battery 130.

[0039] Next, the control unit 57 determines whether or not the temperature of the discharge treatment liquid has stabilized at a predetermined temperature or lower, for example, by using a thermometer provided in the cooler 43 (step S16). When the discharge treatment liquid has been kept at or below a predetermined temperature for a predetermined period of time or longer, the control unit 57 determines that the temperature of the discharge treatment liquid has stabilized at or below a predetermined temperature. Here, the predetermined temperature is, for example, a temperature at which it can be determined that there is a sufficiently low risk of re-ignition of the battery 130. Then, if it is determined that the temperature of the discharge treatment liquid is not stable below the predetermined temperature (step S16; No), the control unit 57 transitions to the above-mentioned step S15 and continues to control the temperature and concentration of the discharge treatment liquid.

[0040] On the other hand, in step S16, if it is determined that the temperature of the discharge treatment liquid has stabilized at or below the predetermined temperature (step S16; Yes), the control unit 57 stops the circulation of the discharge treatment liquid (step S17) and ends the discharge treatment.

[0041] [Technical effect of the present embodiment] As described above, according to this embodiment, the pump 41 that circulates the discharge treatment liquid through the circulation path 31 and the cooler 43 that cools the discharge treatment liquid flowing through the circulation path 31 are controlled, and the discharge treatment liquid at a predetermined temperature is supplied to the battery 130. This allows the discharge treatment liquid, the temperature of which has been appropriately adjusted, to be stably supplied to the battery 130 of the unmanned vehicle 100. Therefore, the battery 130 of the unmanned vehicle 100 can be appropriately discharged.

[0042] Also, according to this embodiment, the circulation path 31 (first circulation path 31a) is configured to be mountable to the drone 100, and includes a connection connector 35 to which the first supply path 32a and the first return path 33a are connected. Thus, by mounting the connector 35 on the unmanned vehicle 100, the discharge treatment liquid can be supplied to and collected directly from the battery 130. As a result, the battery 130 can be discharged in an optimal manner.

[0043] In addition, according to this embodiment, the landing pad 20 is capable of storing a discharge treatment liquid, and has a depth that allows the battery 130 of the unmanned aerial vehicle 100 to be submerged in the liquid (discharge treatment liquid) within the landing pad 20 when the unmanned aerial vehicle 100 stops on the bottom 20a of the landing pad 20. This allows the battery 130 of the unmanned vehicle 100 to be submerged in a discharge treatment liquid within the landing pad 20 and discharged, even if the unmanned vehicle 100 cannot be approached safely.

[0044] In addition, according to this embodiment, the drone is equipped with both a first circulation path 31a that circulates the discharge treatment liquid directly to the battery 130 of the drone 100 via the connection connector 35, and a second circulation path 31b that circulates the discharge treatment liquid to the landing pad 20 where the battery 130 can be submerged. This allows the battery 130 to be discharged appropriately whether or not an operator can approach the unmanned vehicle 100.

[0045] Furthermore, according to this embodiment, the concentration adjusting device 42 is controlled based on the concentration of the discharge treatment liquid flowing through the circulation path 31 . This makes it possible to supply a discharge treatment liquid of an appropriate concentration to the battery 130. As a result, the battery 130 can be discharged in an optimal manner.

[0046] Furthermore, according to this embodiment, the filter 44 removes certain impurities from the discharge treatment liquid circulating through the circulation path 31 . This makes it possible to effectively remove impurities and the like that have become mixed into the discharge treatment liquid.

[0047] [others] Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments (including modified examples). For example, the landing pad 20 of the emergency landing port 1 may simply be a vinyl pool that is inflated with air as long as it is capable of storing the discharge treatment liquid. In this case, the second supply path 32b and the second recovery path 33b may simply be tubes that can be placed on the landing pad 20. The equipment unit 25 may be configured so as to be installable independently of the landing pad 20, and if a fire extinguishing facility can be prepared separately, the equipment unit 25 may not be necessary. In this way, by making the emergency landing port 1 a simplified configuration, it can be installed anywhere, making it suitable for outdoor events, for example.

[0048] In the discharge process of the above embodiment, either the first circulation path 31a or the second circulation path 31b is used. However, for example, in a case where the drone 100 is approached but a fire occurs thereafter, the first circulation path 31a and the second circulation path 31b may be used together. This switching can be performed by appropriately adjusting the opening of the valve 47.

[0049] Furthermore, there are no particular limitations on the shape, structure, etc. of the connector 35 attached to the socket 124 of the drone 100. For example, the first supply path 32a, the first recovery path 33a, and the exhaust path 36 may be connected to the drone 100 individually.

[0050] In the above embodiment, an unmanned aerial vehicle (drone) capable of vertical takeoff and landing has been described as an example of a moving body according to the present invention. However, the present invention can be widely applied to moving bodies equipped with a battery (for example, vehicles, ships, toys imitating these, etc.). In the above embodiment, the liquid circulation device according to the present invention is described as being applied to an emergency landing port of an unmanned aerial vehicle. However, the liquid circulation device according to the present invention is not limited to emergency landing ports and can be widely applied to devices that discharge batteries.

[0051] In addition, the details shown in the above embodiment can be modified as appropriate without departing from the spirit of the invention. [Explanation of symbols]

[0052] 1 Emergency landing port (liquid circulation system) 20 Landing pad (storage means) 20a bottom 20b Wall section 25 Equipment Units 30 Circulation Unit 31 Circulation route 31a 1st circulation route 31b 2nd circulation path 32 Supply route 32a 1st supply route 32b 2nd supply route 33 Recovery Route 33a First Recovery Route 33b 2nd Recovery Route 35 Connector 41 Pump 42 Concentration adjustment device (concentration adjustment means) 43 Cooler (cooling means) 44 Filters 45 First Measurement Unit 46 Second Measurement Unit 57 Control section (control means) 100 Unmanned aerial vehicle (mobile) 120 Main body 130 Battery 132 Battery Mounting Shelf

Claims

1. a supply path for supplying a discharge treatment liquid to a battery of a mobile body, and a circulation path including a recovery path for recovering the supplied discharge treatment liquid; a pump that circulates the discharge treatment solution through the circulation path; A cooling means for cooling the discharge treatment liquid flowing through the circulation path; a control means for controlling the pump and the cooling means to supply the discharge treatment liquid at a predetermined temperature to the battery; A liquid circulation device comprising:

2. The circulation path includes a connector configured to be attachable to the movable body, the supply path includes a first supply path coupled to the connector, The recovery path includes a first recovery path coupled to the connector.

2. The liquid circulation system of claim 1.

3. A storage means for storing the discharge treatment liquid is provided, the supply path includes a second supply path that supplies the discharge treatment liquid to the inside of the storage means, the recovery path includes a second recovery path that recovers the discharge treatment liquid from inside the storage means, the storage means has a depth such that a battery of the moving body is submerged in the liquid in the storage means when the moving body stops at the bottom of the storage means; 3. A liquid circulation system according to claim 1 or 2.

4. A concentration adjusting means is provided for adjusting the concentration of the discharge treatment liquid flowing through the circulation path, The control means controls the concentration adjustment means based on the concentration of the discharge treatment liquid flowing through the circulation path.

2. The liquid circulation system of claim 1.

5. a filter for removing predetermined impurities from the discharge treatment liquid circulating through the circulation path; 2. The liquid circulation system of claim 1.

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