CN213374845U

CN213374845U - Water-based fire extinguishing system and battery replacing cabinet

Info

Publication number: CN213374845U
Application number: CN202021435411.0U
Authority: CN
Inventors: 邱思彬; 邓金波; 王冰; 沈剑; 江旭峰; 黄嘉曦
Original assignee: Shenzhen Immotor Technology Co ltd
Current assignee: Shenzhen Immotor Technology Co ltd
Priority date: 2020-07-20
Filing date: 2020-07-20
Publication date: 2021-06-08
Anticipated expiration: 2030-07-20

Abstract

The application provides a water-based fire-fighting system, which comprises a sheet metal support, a tray, a battery compartment, a water tank, a water outlet pipeline and a water pump, wherein the sheet metal support comprises a cross beam and a stand column, the cross beam and the stand column are sequentially communicated to form a water return pipeline, the tray is arranged at the top of the cross beam and communicated with the cross beam, the battery compartment is arranged in the tray, a fire-fighting spray head is arranged on the top wall of the battery compartment, a first water outlet is formed in the side wall of the battery compartment, the water tank is arranged at the bottom of the sheet metal support and communicated with the stand column, the water outlet pipeline is communicated with; still provide a trade battery cabinet. The application provides a water base fire extinguishing system and trade battery cabinet have adopted fire water to replace inert gas or dry powder, can not only put out the naked light on the battery package rapidly through fire water, can also carry out lasting physics cooling to the battery package to solved and adopted inert gas or dry powder to put out a fire and can't make the problem that the physics was cooled down of battery package realization, prevented that the battery package from taking place secondary deflagration.

Description

Water-based fire extinguishing system and battery replacing cabinet

Technical Field

The application belongs to the technical field of battery charging and replacing devices, and particularly relates to a water-based fire-fighting system and a battery replacing cabinet.

Background

The battery-changing cabinet is a charging device which is arranged in a public place and provides quick and convenient battery pack changing service for electric bicycles for users. The battery pack is generally assembled by a plurality of lithium batteries.

At present, inert gas or dry powder is generally adopted as a main fire extinguishing means for a battery replacement cabinet, but when a fire breaks out from a battery pack, a large amount of heat is generated under the action of combustion and chemical reaction of chemical substances, if the fire breaks out only in the fire extinguishing process and the physical cooling of the battery pack cannot be realized, positive and negative diaphragms of a non-fired lithium battery are easily heated and shrunk, and the positive and negative diaphragms are directly reacted to explode again to cause fire.

SUMMERY OF THE UTILITY MODEL

The application aims to provide a water-based fire-fighting system and a battery replacing cabinet, which comprises but not limited to solving the technical problem that the physical cooling of a battery pack cannot be realized by adopting inert gas or dry powder for fire extinguishing.

In order to achieve the above object, the technical solution adopted by the present application is a water-based fire-fighting system for a power exchange cabinet, comprising:

the metal plate support comprises a cross beam and an upright post, the cross beam and the upright post are both of a hollow structure, and the cross beam and the upright post are sequentially communicated to form a water return pipeline;

the tray is arranged at the top of the cross beam and is communicated with the cross beam;

the battery bin is arranged in the tray, the top wall of the battery bin is provided with a fire-fighting spray head, and the side wall of the battery bin is provided with a first water outlet;

the water tank is arranged at the bottom of the metal plate support, is communicated with the stand column and is used for storing fire fighting water; the water outlet pipeline is communicated with the fire-fighting spray head; and

and the water pump is arranged beside the water tank and connected with the water tank and the water outlet pipeline.

Further, the fire water is a water-based flame retardant, and mainly comprises water, formate ions, acetate ions, sodium ions, potassium ions, calcium ions and magnesium ions.

Furthermore, a containing groove is formed in the tray, the battery compartment is arranged in the containing groove, a water collecting opening is formed in the bottom wall of the containing groove, a first water inlet is formed in the top wall of the cross beam, the position of the water collecting opening corresponds to the position of the first water inlet, a second water inlet is formed in the side wall of the stand column, one end of the cross beam is inserted into the second water inlet, and the bottom end of the stand column is communicated with the water tank.

Furthermore, the water collecting opening is located at the edge of the bottom wall of the accommodating groove, and one side of the tray, which is far away from the water collecting opening, inclines downwards towards the side where the water collecting opening is located.

Furthermore, the tray is provided with a positioning pin extending downwards from the edge of the tray, the cross beam is provided with an insert buckle, and the positioning pin is inserted in the insert buckle.

Further, outlet conduit includes trunk line, branch pipeline and pulls out formula of inserting water coupling, the branch pipeline passes through pull out formula of inserting water coupling respectively with the trunk line with the fire control shower nozzle is connected, the trunk line is fixed in on the stand and follow the stand extends.

Further, the main pipeline and the branch pipeline are sleeved with heat insulation sleeves.

Furthermore, a water level sensor is arranged in the water tank, a water adding port, a second water outlet and a third water inlet are formed in the water tank, the second water outlet is connected with a water inlet of the water pump, the third water inlet is communicated with the stand column, and a filter screen is covered on the third water inlet in a sealing mode.

Further, a gas sensor and/or a temperature sensor is arranged in the battery bin.

The application also provides a trade electric cabinet, including the cabinet body, controller and above-mentioned water base fire extinguishing system, the controller with water base fire extinguishing system locates the cabinet is internal, water base fire extinguishing system includes a plurality of tray and a plurality of the battery compartment, the panel beating support includes a plurality of the crossbeam, the tray with the battery compartment one-to-one, be equipped with a plurality ofly on the crossbeam the tray, the water pump water level sensor reaches gas sensor and/or temperature sensor respectively with the controller electricity is connected.

The application provides a water base fire extinguishing system and switch cabinet's beneficial effect lies in: the fire-fighting water is adopted to replace inert gas or dry powder, so that not only can open fire on the battery pack be quickly extinguished through the fire-fighting water, but also the battery pack can be continuously and physically cooled, thereby solving the technical problem that the physical cooling of the battery pack cannot be realized by adopting the inert gas or the dry powder for extinguishment, ensuring the fire-fighting effect and simultaneously preventing the secondary deflagration of the battery pack; moreover, as the battery bin, the tray, the cross beam, the upright post and the water tank are sequentially communicated to form a recovery passage, the fire-fighting water can be recycled, and the operation cost of the power exchange cabinet is effectively reduced; and because the return water pipeline is constructed by the crossbeam and the stand of panel beating support, need not additionally to add the pipeline, not only simplified water base fire extinguishing system's structure, still reduced water base fire extinguishing system's production and maintenance cost.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

Fig. 1 is a schematic internal structural diagram of a power transformation cabinet provided in an embodiment of the present application;

FIG. 2 is a schematic structural diagram of a water-based fire fighting system provided by an embodiment of the present application;

FIG. 3 is a schematic right-side view of FIG. 1;

fig. 4 is a partially exploded perspective view of a water-based fire fighting system provided by an embodiment of the present application.

The figures are numbered:

1-power-change cabinet, 10-water-based fire-fighting system, 11-sheet metal support, 12-tray, 13-battery compartment, 14-water tank, 15-outlet pipe, 16-water pump, 17-water level sensor, 18-gas sensor, 110-return pipe, 111-crossbeam, 112-upright post, 113-water pipe, 121-containing tank, 122-water collecting port, 123-locating pin, 131-fire sprinkler, 132-first outlet, 141-water adding port, 142-second outlet, 143-third inlet, 151-main pipe, 152-branch pipe, 153-plug-in type water pipe joint, 154-three-way joint, 155-elbow, 1111-first inlet, 1112-plug-in buckle, 1120-second inlet.

Detailed Description

In order to make the technical problems, technical solutions and advantageous effects to be solved by the present application clearer, the present application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.

It should be noted that: when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or be indirectly connected to the other element. When an element is referred to as being "connected" to another element, it can be directly or indirectly connected to the other element. When a component is referred to as being "electrically connected" to another component, it can be electrically connected by conductors, or can be electrically connected by radios, or can be connected by various other means capable of carrying electrical signals. The terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in the orientation or positional relationship indicated in the drawings for convenience of description only and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed in a particular orientation, and be operated in a particular orientation, and therefore are not to be construed as limiting the patent, the particular meaning of which terms will be understood by those skilled in the art as appropriate. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.

Referring to fig. 1 and 2, the water-based fire fighting system 10 provided by the present application is used on a power conversion cabinet 1, and includes a sheet metal bracket 11, a tray 12, a battery compartment 13, a water tank 14, a water outlet pipe 15 and a water pump 16, wherein the sheet metal bracket 11 includes a beam 111 and a column 112, the beam 111 and the column 112 are both hollow structures, and the beam 111 and the column 112 are sequentially communicated to form a water return pipe 110; the tray 12 is disposed on top of the cross beam 111, and the tray 12 communicates with the cross beam 111; the battery compartment 13 is arranged in the tray 12, and the top wall of the battery compartment 13 is provided with a fire-fighting nozzle 131, that is, the fire-fighting nozzle 131 is arranged on the top wall of the battery compartment 13 in a penetrating manner, the water inlet end of the fire-fighting nozzle 131 is exposed out of the battery compartment 13, the water outlet end of the fire-fighting nozzle 131 extends into the inner cavity of the battery compartment 13, and meanwhile, the side wall of the battery compartment 13 is provided with a first water outlet 132, and the first water outlet 132 is used for discharging fire-fighting water; the water tank 14 is arranged at the bottom of the sheet metal bracket 11, and the water tank 14 is communicated with the upright column 112 and used for storing fire fighting water; the water outlet pipeline 15 is communicated with the fire-fighting nozzle 131; a water pump 16 is provided beside the water tank 14, and the water pump 16 connects the water tank 14 and the water outlet pipe 15, i.e., the water outlet pipe 15 is communicated with the water tank 14 through the water pump 16, and fire water stored in the water tank 14 is pumped into and out of the water pipe 15 by the water pump 16 and delivered to the fire sprinkler 131.

When a battery pack in the battery replacing cabinet 1 catches fire, firstly, the fire-fighting nozzle 131 is triggered, the water pump 16 is started at the same time, fire-fighting water stored in the water tank 14 is pumped into the water inlet pipeline 15 and the water outlet pipeline 15 conveys the fire-fighting water to the fire-fighting nozzle 131, the fire-fighting nozzle 131 sprays the fire-fighting water into the battery bin 13 to extinguish open fire on the battery pack, and meanwhile, the battery pack is cooled to prevent the battery pack from secondary deflagration; in the process, the fire water sprayed on the battery pack flows out of the battery compartment 13 from the first water outlet 132 of the battery compartment 13 after passing through the battery pack, enters the tray 12, and then flows back into the water tank 14 after sequentially passing through the cross beam 111 and the upright post 112, so that the fire water can be recycled.

According to the water-based fire fighting system 10, fire water is adopted to replace inert gas or dry powder, open fire on the battery pack can be quickly extinguished through the fire water, and the battery pack can be subjected to continuous physical cooling, so that the technical problem that the physical cooling of the battery pack cannot be realized by adopting the inert gas or the dry powder for fire extinguishing is solved, the fire fighting effect is ensured, and secondary deflagration of the battery pack is prevented; moreover, as the battery compartment 13, the tray 12, the cross beam 111, the upright post 112 and the water tank 14 are sequentially communicated to form a recovery passage, the fire fighting water can be recycled, and the operation cost of the power exchange cabinet 1 is effectively reduced; moreover, the water return pipeline 110 is constructed by the cross beam 111 and the upright post 112 of the sheet metal bracket 11, so that additional pipelines are not needed, the structure of the water-based fire fighting system 10 is simplified, and the production and maintenance cost of the water-based fire fighting system 10 is reduced.

Further, as a specific example of the water-based fire-fighting system provided by the present application, the fire-fighting water is a water-based fire retardant, and the fire-fighting water mainly comprises water, formate ions, acetate ions, sodium ions, potassium ions, calcium ions, magnesium ions, and the like. The fire-fighting water is prepared by adopting purified water, formate, acetate and the like, and the main chemical component of the fire-fighting water is sodium formate, so that the freezing point of the fire-fighting water can reach minus 50 ℃, the fluidity of the fire-fighting water can not be influenced even in a low-temperature environment, and the situations of icing or pipeline blockage and the like can be effectively avoided; and the fire-fighting water has strong corrosion resistance (the corrosion to metals such as steel Q235 and the like is less than or equal to 0.05mm/a), so the fire-fighting water is not influenced by low temperature and does not corrode a cabinet. Meanwhile, when the battery pack explodes, the direct contact of the anode and the cathode of the battery pack can generate a thermal runaway effect (the highest temperature can reach 930 ℃), and at the moment, the fire-fighting water is sprayed onto the battery pack, so that the battery pack supplies energy to the fire-fighting water, the fire-fighting water is electrolyzed, the energy is transferred, and continuous thermal runaway caused by the direct contact of the anode and the cathode of the battery pack is avoided.

Further, referring to fig. 1 to 4, as an embodiment of the water-based fire fighting system provided by the present application, the tray 12 is provided with the accommodating groove 121, the battery compartment 13 is disposed in the accommodating groove 121, the bottom wall of the accommodating groove 121 is provided with the water collecting port 122, meanwhile, the top wall of the cross beam 111 is provided with the first water inlet 1111, the water collecting port 122 is located corresponding to the first water inlet 1111, that is, when the tray 12 is fixed on the cross beam 111, the water collecting port 122 is aligned with the first water inlet 1111, in addition, the side wall of the upright post 112 is provided with the second water inlet 1120, one end of the cross beam 111 is inserted into the second water inlet 1120, and the bottom end of the upright post 112 is communicated with the water tank 14. Specifically, the area that first water inlet 1111 surrounds is greater than or equal to the area that water-collecting opening 122 surrounds to ensure that the fire water that flows through water-collecting opening 122 can not overflow outside first water inlet 1111, the one end of crossbeam 111 passes second water inlet 1120 and stretches into the inner chamber of stand 112, crossbeam 111 can be through welding or the mode of fastener connection and stand 112 fastening connection, the third delivery port has been seted up on the bottom of stand 112, the third delivery port leads to pipe 113 and is connected with the third inlet 143 of water tank 14, in order to ensure that fire water flows back into water tank 14 at last. In the process of extinguishing fire in the water-based fire-fighting system 10, fire-fighting water continuously flows out from the first water outlet 132 of the battery compartment 13, firstly enters the accommodating groove 121 of the tray 12, then flows into the inner cavity of the cross beam 111 through the water collecting port 122 and the first water inlet 1111 after being accumulated at the water collecting port 122 of the tray 12, then flows into the inner cavity of the upright post 112 from the second water inlet 1120 of the upright post 112 through the inner cavity of the cross beam 111, and finally flows into the inner cavity of the water tank 14 through the water pipe 113, so that the fire-fighting water is recovered.

Further, referring to fig. 3, as an embodiment of the water-based fire fighting system provided by the present application, the water collecting opening 122 of the tray 12 is located at an edge of the bottom wall of the containing groove 121, and a side of the tray 12 away from the water collecting opening 122 is inclined downward toward a side of the water collecting opening 122, that is, a height of the side of the tray 12 away from the water collecting opening 122 is greater than a height of the side of the water collecting opening 122 of the tray 12. Preferably, the bottom wall of the tray 12 has an included angle with the horizontal plane of more than 0 degree and less than or equal to 20 degrees, and the water collection port 122 is located at the lowest position of the bottom wall of the accommodating groove 121, so that not only the fire-fighting water discharged from the first water outlet 132 can be promoted to be accumulated to the water collection port 122, but also the battery compartment has an inclination angle of more than 0 degree and less than or equal to 20 degrees, so that the battery pack can easily slide into the battery compartment 13 under the action of self weight, and the replacement efficiency of the battery pack is improved.

Further, referring to fig. 4, as an embodiment of the water-based fire fighting system provided by the present application, a positioning pin 123 is provided on the tray 12, the positioning pin 123 extends downward from an edge of the tray 12, and meanwhile, a buckle 1112 is provided on the cross beam 111, and the positioning pin 123 is inserted into the buckle 1112. Specifically, the positioning pin 123 is fixed to a side wall of the tray 12 near the water collection port 122, and the catch 1112 is fixed to a side wall of the cross member 111 adjacent to the first water inlet 1111. When the tray 12 and the cross beam 111 are assembled, the positioning pin 123 is aligned to the inserting buckle 1112 and inserted into the inserting buckle 1112, so that the tray 12 and the cross beam 111 can be quickly positioned, the water collecting opening 122 of the tray 12 can be aligned to the first water inlet 1111 of the cross beam 111, and the assembling efficiency of the tray 12 and the cross beam 111 is effectively improved. In addition, a first mounting hole may be formed in the positioning pin 123, a second mounting hole may be formed in the buckle 1112, and the tray 12 may be fastened and connected to the cross beam 111 by screwing the screws into the second mounting hole and the first mounting hole.

Further, referring to fig. 2, as an embodiment of the water-based fire-fighting system provided by the present application, the outlet pipe 15 includes a main pipe 151, a branch pipe 152 and a plug-in type water pipe joint 153, wherein the branch pipe 152 is connected to the main pipe 151 and the fire sprinkler 131 of the battery compartment 13 through the plug-in type water pipe joint 153, the main pipe 151 is fixed on the column 112, and the main pipe 151 extends along the column 112. Specifically, since the power distribution cabinet 1 includes a plurality of battery compartments 13 arranged in the horizontal direction and the vertical direction, and is matched with the plurality of battery compartments 13, a plurality of trays 12 and a plurality of beams 111 are required, the plurality of beams 111 are arranged on the column 112 at intervals in the vertical direction, and at least two battery compartments 13 are arranged on each beam 111 in the horizontal direction, so as to facilitate subsequent maintenance and replacement of the water outlet pipe 15, the main pipe 151 may be composed of a plurality of first water pipes, the branch pipe 152 may be composed of a plurality of second water pipes, each beam 111 corresponds to one first water pipe, each battery compartment 13 corresponds to one second water pipe, and the pluggable water pipe joints 153, the three-way joints 154 and the elbow 155 may be connected between the first water pipe and the first water pipe, between the first water pipe and the second water pipe, between the second water pipe and the fire sprinkler 131, and between the second water pipe and the second water pipe, and the pluggable water pipe joints 153 are also referred to as water pipe quick joints, the quick connection and disassembly of the first water pipe and the three-way joint 154, the first water pipe and the elbow 155, the second water pipe and the three-way joint 154 and the second water pipe and the elbow 155 can be realized, and the efficiency of the outlet pipe 15 in local maintenance and replacement is improved. In addition, a water flow sensor may be disposed in the pluggable water pipe joint 153 or the three-way joint 154 or the elbow 155 connected to the fire sprinkler 131 for detecting whether fire water flows through the branch pipe 152 to ensure effective fire extinguishing, and if fire water does not flow through the branch pipe 152, the controller of the battery replacement cabinet 1 will issue an alarm to remind the user to replenish fire water.

Further, referring to fig. 2, as an embodiment of the water-based fire-fighting system provided by the present application, an insulating sleeve is sleeved on the main pipe 151 and the branch pipe 152. The heat insulation sleeve can effectively protect the main pipe 151 and the branch pipe 152, and softening and cracking caused by high temperature of the main pipe 151 and the branch pipe 152 are avoided.

Further, referring to fig. 1 to 3, as an embodiment of the water-based fire fighting system provided by the present application, a water level sensor 17 is disposed in the water tank 14, and a water filling port 141, a second water outlet 142 and a third water inlet 143 are disposed on the water tank 14, the second water outlet 142 is connected to a water inlet of the water pump 16, and the third water inlet 143 is communicated with the pillar 112. Specifically, a water level sensor 17 is fixed on the inner wall of the water tank 14 and used for detecting the water level of the fire fighting water to prevent the fire fighting water from being insufficient to extinguish a fire; the water adding port 141 and the third water inlet 143 are located at the top of the water tank 14, so that the fire water can be prevented from overflowing outwards when the water level of the water tank 14 is too high, the second water outlet 142 is located at the bottom of the water tank 14, the volume of the water tank 14 can be fully utilized, and the situation that the fire water cannot be pumped by the water pump 16 under the sufficient condition of the fire water can be avoided. In addition, a filter screen (not shown) can be covered on the third water inlet 143, and the filter screen can filter out impurities in the fire-fighting water in the water return pipe 110, so as to prevent the impurities from entering the water outlet pipe 15 along with the fire-fighting water to cause the water pump 16 and/or the fire-fighting nozzle 131 to be blocked or damaged.

Further, referring to fig. 2, as one embodiment of the water-based fire fighting system provided by the present application, a gas sensor 18 and/or a temperature sensor is disposed within the battery compartment 13. Specifically, a gas sensor 18 and/or a temperature sensor is fixed on the inner wall of the battery compartment 13 for detecting whether the battery pack in the battery compartment 13 is on fire or has an excessive temperature.

Referring to fig. 1 and 2, the power exchange cabinet 1 provided by the present application includes a cabinet body (not shown), a controller (not shown), and the water-based fire fighting system 10, wherein the controller and the water-based fire fighting system 10 are disposed in the cabinet body, the water-based fire fighting system 10 includes a plurality of trays 12 and a plurality of battery compartments 13, the sheet metal bracket 11 includes a plurality of cross beams 111, the trays 12 correspond to the battery compartments 13 one to one, the cross beams 111 are provided with a plurality of trays 12, and the water pump 16, the water level sensor 17, the gas sensor 18 and/or the temperature sensor are respectively electrically connected to the controller. Specifically, the upright column 112 extends in the vertical direction, a plurality of beams 111 are fixed on the upright column 112 at intervals in the vertical direction, the beams 111 extend in the horizontal direction, at least two trays 12 are arranged on each beam 111 at intervals, a battery compartment 13 is placed on each tray 12, and the water pump 16, the water level sensor 17, the gas sensor 18 and/or the temperature sensor are controlled by the controller. When the gas sensor 18 and/or the temperature sensor detect that gas such as smoke, fog and the like and/or the temperature in the battery compartment 13 are/is too high, the controller starts the water pump 16, the water pump 16 pumps fire water in the water tank 14 into the water inlet pipeline 15 and the water outlet pipeline 15, the fire water is conveyed to the fire-fighting spray head 131 through the main pipeline 151 and the branch pipeline 152, at the moment, the fire-fighting spray head 131 is opened, and the fire-fighting water is sprayed into the battery compartment 13 to extinguish fire and cool the battery pack; when the water level sensor 17 detects that the water level of the water tank 14 is lower than the alarm line, the controller will send an alarm to the operator of the electricity exchange cabinet 1 to remind the operator of adding water in time.

According to the power exchange cabinet 1, the water-based fire-fighting system 10 is adopted, open fire on the battery pack can be quickly extinguished through fire-fighting water, and the battery pack can be subjected to continuous physical cooling, so that the technical problem that the physical cooling of the battery pack cannot be realized by adopting inert gas or dry powder for fire extinguishment is solved, the fire-fighting effect is ensured, and secondary deflagration of the battery pack is prevented; and because battery compartment 13, tray 12, crossbeam 111, stand 112 and water tank 14 communicate in proper order and have formed a recovery passageway for fire water can be by cyclic utilization, has reduced the operation cost of electricity changing cabinet 1 effectively.

The above description is only exemplary of the present application and should not be taken as limiting the present application, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A water-based fire-fighting system for a power distribution cabinet, comprising:

the water tank is arranged at the bottom of the metal plate support, is communicated with the stand column and is used for storing fire fighting water;

the water outlet pipeline is communicated with the fire-fighting spray head; and

2. The water-based fire protection system of claim 1, wherein the fire-fighting water is a water-based fire retardant, the fire-fighting water comprising primarily water, formate ions, acetate ions, sodium ions, potassium ions, calcium ions, and magnesium ions.

3. The water-based fire-fighting system according to claim 1, wherein the tray defines a receiving cavity, the battery compartment is disposed in the receiving cavity, a bottom wall of the receiving cavity defines a water collecting opening, a top wall of the cross beam defines a first water inlet, the water collecting opening is located at a position corresponding to the first water inlet, a side wall of the upright post defines a second water inlet, one end of the cross beam is inserted into the second water inlet, and a bottom end of the upright post is communicated with the water tank.

4. A water-based fire fighting system as defined in claim 3, wherein said water collection opening is located at an edge of the bottom wall of said receiving tank, and a side of said tray remote from said water collection opening is inclined downwardly to a side of said water collection opening.

5. The water-based fire fighting system of claim 3, wherein the tray is provided with positioning pins extending downward from edges of the tray, and the cross beam is provided with insertion buckles, the positioning pins being inserted into the insertion buckles.

6. The water-based fire fighting system of claim 1, wherein said outlet conduit includes a main conduit, a branch conduit and a pull-and-insert type water coupling, said branch conduit being connected to said main conduit and said fire sprinkler head, respectively, by said pull-and-insert type water coupling, said main conduit being secured to and extending along said column.

7. A water-based fire fighting system as defined in claim 6, wherein said main pipe and said branch pipes are jacketed with insulation.

8. The water-based fire-fighting system according to any one of claims 1 to 7, wherein a water level sensor is disposed in the water tank, the water tank is provided with a water filling port, a second water outlet and a third water inlet, the second water outlet is connected to the water inlet of the water pump, and the third water inlet is communicated with the column.

9. The water-based fire fighting system of claim 8, wherein a gas sensor and/or a temperature sensor is disposed within the battery compartment.

10. The power exchange cabinet is characterized by comprising a cabinet body, a controller and the water-based fire-fighting system according to claim 9, wherein the controller and the water-based fire-fighting system are arranged in the cabinet body, the water-based fire-fighting system comprises a plurality of trays and a plurality of battery bins, the sheet metal support comprises a plurality of cross beams, the trays correspond to the battery bins one by one, the cross beams are provided with a plurality of trays, and the water pump, the water level sensor, the gas sensor and/or the temperature sensor are electrically connected with the controller respectively.