Immersed fire extinguishing system

Abstract

The embodiment of the invention provides an immersed fire extinguishing system which comprises a battery cell module used for storing energy; the battery cell container is used for accommodating the battery cell module, the battery cell container is filled with cooling liquid, and the battery cell module is immersed in the cooling liquid; the heat exchange system comprises a first heat exchange device and a first heat exchange pipe, the first heat exchange pipe is filled with first heat exchange liquid, the first heat exchange device is located on the outer side of the battery cell container, and the first heat exchange device exchanges heat with the cooling liquid through the first heat exchange pipe. A covering layer can be formed on the surface of the battery cell module through the cooling liquid, oxygen and combustible gas are isolated, and combustion spreading is prevented. The first heat exchange device is arranged on the outer side of the battery cell container and exchanges heat with the cooling liquid through the first heat exchange pipe, one heat exchange device can be connected with a plurality of heat exchange pipes, a plurality of battery cell modules are cooled at the same time, and a complete liquid cooling system does not need to be arranged in each battery cell container, so that the equipment investment is reduced.

Description

Technical Field

[0001] This application relates to the field of energy storage, and more particularly to a submersible fire protection system. Background Technology

[0002] The global energy structure is rapidly transitioning towards renewable energy, with intermittent energy sources such as wind and solar power accounting for an increasing proportion. However, due to the volatility and instability of wind and solar power generation, energy storage systems have become a crucial link in achieving efficient energy utilization and stable grid operation. Current mainstream electrochemical energy storage systems are based on lithium-ion batteries, whose high energy density significantly improves energy storage efficiency, but also brings serious safety risks. Fires caused by thermal runaway of battery cells are characterized by intense combustion, rapid heat spread, high re-ignition potential, and difficulty in extinguishing.

[0003] In related technologies, traditional fire suppression systems mostly use gaseous fire extinguishing agents (such as heptafluoropropane and inert gases) or dry powder extinguishing agents. However, these solutions rely on physically diluting oxygen or cutting off the combustion chain, which are delayed remedial measures that can only extinguish open flames but cannot fundamentally inhibit the spread of fire. In addition, existing liquid cooling systems generally adopt a scheme of installing a liquid cooling system in each battery compartment, dissipating heat through air cooling or liquid cooling plates. The battery cells and coolant are in indirect contact through the liquid cooling box, which has problems such as low heat conduction efficiency, high risk of local overheating, and large equipment investment. It is difficult to meet the requirements of high-energy-density battery cells for rapid heat dissipation and intrinsic safety. Summary of the Invention

[0004] This application provides a submersible fire protection system to suppress fire spread, improve heat transfer efficiency, reduce the risk of local overheating, and reduce equipment investment.

[0005] In a first aspect, embodiments of this application provide a submersible fire protection system, comprising:

[0006] Battery cell modules are used for energy storage;

[0007] A cell container for accommodating the cell module, the cell container being filled with coolant, and the cell module being immersed in the coolant;

[0008] A heat exchange system, comprising a first heat exchange device and a first heat exchange tube, wherein the first heat exchange tube is filled with a first heat exchange liquid, the first heat exchange device is located outside the battery cell container, and the first heat exchange device exchanges heat with the coolant through the first heat exchange tube.

[0009] In one possible implementation, the first heat exchange device is connected to a plurality of first heat exchange tubes connected in parallel, and the number of the battery cell container matches the number of the first heat exchange tubes, and they are connected in a one-to-one correspondence.

[0010] In one possible implementation, the coolant is a supramolecular halogenated hydrocarbon compound.

[0011] In one possible implementation, a monitoring component, a battery management unit, a battery control unit, and an energy management system are also included. The monitoring component is used to monitor the temperature of the cell module and the level of the coolant. The monitoring component is electrically connected to the battery management unit, the battery control unit, and the energy management system.

[0012] In one possible implementation, the monitoring component includes an ultrasonic level detector disposed within the cell container for measuring the level of the coolant.

[0013] In one possible implementation, the monitoring component includes a grating optical fiber with multiple grating temperature measurement points evenly spaced on the grating optical fiber, and the battery cell module includes multiple battery cells arranged in an array, with the grating optical fiber wound around the poles of the multiple battery cells.

[0014] In one possible implementation, the battery control unit is connected to an audible and visual alarm device.

[0015] In one possible implementation, the heat exchange system further includes a second heat exchange device and a second heat exchange tube, the second heat exchange device and the second heat exchange tube being filled with a second heat exchange liquid, and the second heat exchange device exchanging heat with the first heat exchange liquid through the second heat exchange tube.

[0016] In one possible implementation, the second heat exchange device includes a cooling tower and a booster pump, the booster pump being used to pump the second heat exchange liquid to the top of the cooling tower, the cooling tower being used to increase the contact area between the second heat exchange liquid and the air, so that the second heat exchange liquid and the air can exchange heat.

[0017] And / or, the second heat exchange liquid is water.

[0018] In one possible implementation, the first heat exchange liquid is a 50% aqueous solution of ethylene glycol;

[0019] And / or, the first heat exchange device includes an air-cooling component for cooling the first heat exchange liquid.

[0020] The immersion fire suppression system provided in this application immerses the battery cell modules in coolant, allowing the coolant to directly contact the modules. The coolant's physical heat absorption properties reduce the cell temperature, improving heat transfer efficiency and lowering the risk of localized overheating. When the battery cell generates heat during operation, the coolant absorbs the heat through heat conduction and transfers it to a first heat exchange device outside the cell container via a first heat exchange tube. The coolant can form a coating layer on the surface of the cell module, isolating oxygen and combustible gases and preventing the spread of combustion. Furthermore, by placing the first heat exchange device outside the cell container and exchanging heat with the coolant through the first heat exchange tube, one heat exchange device can connect to multiple heat exchange tubes, simultaneously cooling multiple cell modules. This eliminates the need for a complete liquid cooling system in each cell container, thus reducing equipment investment. Attached Figure Description

[0021] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0022] Figure 1 This is a structural schematic diagram of the submersible fire protection system provided in this application;

[0023] Figure 2 A schematic diagram of the working process of the submersible fire protection system provided in this application.

[0024] Explanation of reference numerals in the attached figures:

[0025] 1. Battery cell container; 2. Battery cell module; 3. Coolant; 4. First heat exchange device; 5. First heat exchange tube; 6. Second heat exchange device; 7. Second heat exchange tube.

[0026] The accompanying drawings illustrate specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concept of this application to those skilled in the art through reference to particular embodiments. Detailed Implementation

[0027] First, those skilled in the art should understand that these embodiments are merely for explaining the technical principles of this application and are not intended to limit the scope of protection of this application. Those skilled in the art can make adjustments as needed to adapt to specific application scenarios.

[0028] Secondly, it should be noted that, in the description of the embodiments of this application, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application according to the specific circumstances.

[0029] The global energy structure is rapidly transitioning towards renewable energy, with intermittent energy sources such as wind and solar power accounting for an increasing proportion. However, due to the volatility and instability of wind and solar power generation, energy storage systems have become a crucial link in achieving efficient energy utilization and stable grid operation. Current mainstream electrochemical energy storage systems are based on lithium-ion batteries, whose high energy density significantly improves energy storage efficiency, but also brings serious safety risks. Fires caused by thermal runaway of battery cells are characterized by intense combustion, rapid heat spread, high re-ignition potential, and difficulty in extinguishing.

[0030] In related technologies, gas extinguishing systems (such as heptafluoropropane and dry powder) or water spray systems are commonly used. Their core principle is to physically isolate oxygen or break the combustion chain. However, these solutions have significant drawbacks: the extinguishing medium cannot penetrate the battery cell, only extinguishing surface flames; residues after extinguishing can corrode equipment and cannot prevent reignition; the system is complex, requiring gas storage tanks, pipelines, spraying devices, etc., resulting in high investment costs. Furthermore, traditional liquid cooling solutions often use air cooling or liquid cooling plates for indirect heat dissipation. The battery cell and coolant are in indirect contact through the liquid cooling chamber, leading to low heat transfer efficiency and a high risk of localized overheating. For example, liquid cooling chambers require heat dissipation through the chamber, with the battery cell and coolant not in direct contact, resulting in uneven heat dissipation, high system energy consumption, and high equipment redundancy. In addition, existing liquid cooling systems are installed in each battery compartment, resulting in high equipment investment and occupying internal space, reducing the space available for battery cell modules and making it difficult to meet the requirements of high-energy-density cells for rapid heat dissipation and intrinsic safety.

[0031] To address the aforementioned issues, this application provides an immersion fire suppression system, comprising a battery module, a battery container, and a heat exchange system. The battery module is used for energy storage, and the battery container is used to house the battery module. The battery container is filled with coolant, and the battery module is immersed in the coolant. The heat exchange system includes a first heat exchange device and a first heat exchange tube. The first heat exchange tube is filled with a first heat exchange liquid. The first heat exchange device is located outside the battery container, and the first heat exchange device exchanges heat with the coolant through the first heat exchange tube.

[0032] The immersion fire suppression system provided in this application immerses the battery cell modules in coolant, with the coolant in direct contact with the modules. Utilizing the coolant's physical heat absorption properties, the system lowers the cell temperature, improves heat transfer efficiency, and reduces the risk of localized overheating. When the battery cell generates heat during operation, the coolant absorbs the heat through heat conduction and transfers it to a first heat exchange device outside the cell container via a first heat exchange tube. The coolant can form a coating layer on the surface of the cell module, isolating oxygen and combustible gases and preventing the spread of combustion. Furthermore, by placing the first heat exchange device outside the cell container and exchanging heat with the coolant through the first heat exchange tube, one heat exchange device can connect to multiple heat exchange tubes, simultaneously cooling multiple battery cell modules. This eliminates the need for a complete liquid cooling system in each cell container, thereby reducing equipment investment.

[0033] To make the above-mentioned objectives, features, and advantages of the embodiments of this application more apparent and understandable, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0034] Figure 1 This is a structural diagram of the submersible fire protection system provided in this application, where the arrows indicate the direction of liquid flow. Figure 2 A schematic diagram of the working process of the submersible fire protection system provided in this application.

[0035] Please refer to Figure 1 This application provides an immersion fire protection system, including a battery module 2, a battery container 1, and a heat exchange system. The battery module 2 is used for energy storage, and the battery container 1 is used to contain the battery module 2. The battery container 1 is filled with coolant 3, and the battery module 2 is immersed in the coolant 3. The heat exchange system includes a first heat exchange device 4 and a first heat exchange tube 5. The first heat exchange tube 5 is filled with a first heat exchange liquid. The first heat exchange device 4 is located outside the battery container 1, and the first heat exchange device 4 exchanges heat with the coolant 3 through the first heat exchange tube 5.

[0036] The immersion fire suppression system provided in this application immerses the battery cell module 2 in coolant 3, with the coolant 3 in direct contact with the battery cell module 2. Utilizing the heat absorption properties of the coolant 3, the battery cell temperature is reduced, improving heat transfer efficiency and lowering the risk of localized overheating. When the battery cell generates heat during operation, the coolant 3 absorbs the heat through heat conduction and transfers it to the first heat exchange device 4 outside the battery cell container 1 via the first heat exchange pipe 5. The coolant 3 can form a covering layer on the surface of the battery cell module 2, isolating oxygen and combustible gases and preventing the spread of combustion. Furthermore, by placing the first heat exchange device 4 outside the battery cell container 1 and exchanging heat with the coolant 3 via the first heat exchange pipe 5, one heat exchange device can connect multiple heat exchange pipes, simultaneously cooling multiple battery cell modules 2. This eliminates the need for a complete liquid cooling system in each battery cell container 1, thereby reducing equipment investment.

[0037] In some embodiments of this application, the first heat exchange device 4 is connected to a plurality of first heat exchange tubes 5 connected in parallel with each other, and the number of battery cell 1 matches the number of first heat exchange tubes 5, and they are connected in a one-to-one correspondence.

[0038] By setting up multiple parallel first heat exchange tubes 5, which exchange heat with the coolant 3 in multiple cell containers 1 respectively, a single heat exchange device can achieve the effect of heat exchange between the coolant 3 in multiple cell containers 1. Compared with the related technology of arranging a complete liquid cooling system in each cell container 1, this reduces equipment investment and saves costs. Moreover, by reducing the structure of the liquid cooling system in the cell container 1, the space used by the cell module 2 is increased while the volume of the cell container 1 remains unchanged, allowing it to accommodate more cells and thus increase the amount of power it can carry.

[0039] It is understood that each first heat exchange tube 5 is equipped with a circulation pump (not shown in the figure) to circulate the first heat exchange liquid. The portion of the first heat exchange tube 5 in the battery cell container 1 is arranged in a spiral or serpentine pattern to increase the contact area between the first heat exchange tube 5 and the coolant 3 and improve the cooling effect.

[0040] In some embodiments of this application, the number of battery cell containers 1 is four. It can be understood that the number of battery cell containers 1 is 8, 10, etc., and this application does not limit it.

[0041] In some embodiments of this application, the coolant 3 is a supramolecular halogenated hydrocarbon compound.

[0042] Conventional fire extinguishing materials (such as heptafluoropropane, inert gases, dry powder, aerosols, and water spray extinguishing agents) isolate oxygen or break the combustion chain through physical dilution. This method is a delayed remedial fire extinguishing method, which can only extinguish open flames and cannot fundamentally suppress the occurrence of fires, often leading to easy reignition. Referring to Table 1, supramolecular halogenated hydrocarbon compounds are more advantageous as coolant 3. Their insulation resistance is >0.1 GΩ, volume resistivity is >10¹² Ω·cm, they have high breakdown voltage, good cooling performance, and high flame retardancy. They can completely suppress heat conduction, and their freezing point is ≤-113℃, making them suitable for use in vast cold regions. Their overall performance is superior to materials such as deionized water, silicone oil, and hydrocarbon oil. This application uses supramolecular halogenated hydrocarbon compounds as coolant 3, and the battery cell module 2 is immersed in the supramolecular halogenated hydrocarbon compound. When the battery cell module 2 experiences thermal runaway, the supramolecular halogenated hydrocarbon compound can absorb the heat released by the battery cell, reduce the surface temperature of the battery cell, and inhibit the generation of flammable gases. Supramolecular halogenated hydrocarbon compounds are themselves flame retardant materials that can capture free radicals in the combustion reaction, prevent the spread of flame, and slow down or even terminate the combustion reaction. Supramolecular halogenated hydrocarbon compounds can form a coating layer on the surface of the battery cell, isolating oxygen and combustible gases, preventing the spread of combustion, and the immersion environment can isolate dust and moisture, reducing the possibility of hardware damage due to moisture.

[0043] Table 1. Comparison of supramolecular haloalkanes immersion solutions with similar immersion solutions

[0044]

[0045] In some embodiments of this application, a monitoring component, a battery management unit (BMU), a battery control unit (BCU), and an energy management system (EMS) are also included. The monitoring component is used to monitor the temperature of the cell module 2 and the level of the coolant 3. The monitoring component is electrically connected to the battery management unit, the battery control unit, and the energy management system.

[0046] The monitoring component acquires real-time temperature data of cell module 2 and coolant level data of coolant 3, and transmits the data to the battery control unit via the battery management unit. When the temperature data of cell module 2 and / or the coolant level data of coolant 3 exceed the set range, an event handling state is entered, and the battery control unit and energy management system perform event handling, such as alarm or disconnection.

[0047] In some embodiments of this application, the monitoring component includes an ultrasonic level detector, which is disposed inside the cell container 1 and above the coolant 3, for measuring the level of the coolant 3.

[0048] The coolant 3 needs to ensure that materials such as battery cells are submerged within it to exert its various physical and chemical properties. By placing an ultrasonic level detector above the coolant 3, the level of the coolant 3 can be monitored. Furthermore, the ultrasonic level detector does not need to be in direct contact with the coolant 3 being measured, avoiding compatibility issues such as corrosion, adhesion, and wear. It has a long service life and low maintenance costs. Moreover, the price of the ultrasonic level detector is much lower than that of lidar, which can further reduce costs.

[0049] In some embodiments of this application, the monitoring component includes a grating optical fiber (not shown in the figure), with multiple grating temperature measurement points evenly spaced on the grating optical fiber, and the battery cell module 2 includes multiple battery cells arranged in an array, with the grating optical fiber wound around the poles of the multiple battery cells.

[0050] A fiber grating is a periodic refractive index modulation structure in the core layer of an optical fiber, reflecting only light of a specific Bragg wavelength. Temperature changes cause the fiber to expand and contract, altering the core refractive index and resulting in Bragg wavelength drift. The temperature can be determined by detecting this drift. By arranging multiple grating temperature measurement points at equal intervals on the grating fiber and winding the grating fiber around the electrodes of multiple battery cells, the grating temperature measurement points can uniformly cover the electrode sheets, capturing temperature changes between electrode layers from all directions during charging and discharging. Furthermore, the array arrangement of multiple grating temperature measurement points on the battery cell module 2 allows for focused monitoring of temperature-prone areas such as the center and edges of the electrode sheets, enabling continuous field temperature measurement of multiple battery packs. Compared to traditional thermocouple temperature measurement, grating fiber offers a wider temperature measurement range, extremely low transmission attenuation (single-mode fiber transmission attenuation as low as 0.2 dB / km), strong anti-interference capabilities, high reliability, fewer potential failure points, and lower maintenance costs.

[0051] In some embodiments of this application, a single grating optical fiber is wound sequentially around the terminals of multiple battery cells, connecting the multiple terminals in series. Temperature monitoring of multiple battery cells can be achieved through a single grating optical fiber, thus reducing costs.

[0052] In some embodiments of this application, the battery control unit is connected to an audible and visual alarm device.

[0053] When the temperature data of the battery cell module 2 and / or the liquid level data of the coolant 3 exceed the set range, the event handling state is entered. The battery control unit controls the audible and visual alarm device to issue an alarm and remind the staff to take action.

[0054] Understandable, please refer to Figure 2This application can also take different measures based on the monitored temperature and / or liquid level data. For example, the standard liquid level of coolant 3 in cell container 1 is set to 100mm. When the liquid level of coolant 3 is detected to be 90mm (at which point the liquid level is higher than the top surface of cell module 2), the battery control unit controls the audible and visual alarm device to sound an alarm. When the liquid level of coolant 3 is detected to be 80mm (at which point the liquid level is lower than the top surface of cell module 2), the battery control unit controls the high-voltage box of cell module 2 to disconnect. Alternatively, it can be set that when the temperature of a cell in cell module 2 exceeds the normal range of 0℃~10℃, the battery control unit controls the audible and visual alarm device to sound an alarm. When the temperature of a cell in cell module 2 exceeds the normal range by more than 10℃, the battery control unit controls the high-voltage box of the battery cluster containing that cell to disconnect via the energy management system.

[0055] In some embodiments of this application, the heat exchange system further includes a second heat exchange device 6 and a second heat exchange tube 7, wherein the second heat exchange device 6 and the second heat exchange tube 7 are filled with a second heat exchange liquid, and the second heat exchange device 6 exchanges heat with the first heat exchange liquid through the second heat exchange tube 7.

[0056] Specifically, the first heat exchange device 4 is equipped with a bidirectional heat exchange plate (not shown in the figure). The first heat exchange tube 5 and the second heat exchange tube 7 are respectively connected to both sides of the bidirectional heat exchange plate, enabling heat exchange between the first and second heat exchange liquids. The first heat exchange liquid transfers heat to the second heat exchange liquid, and then carries the heat to the second heat exchange device 6. The second heat exchange device 6 can lower the temperature of the second heat exchange liquid through convection cooling circulation, and then exchange heat with the first heat exchange liquid again. In winter or other low ambient temperatures, convection cooling circulation can be achieved with a small amount of energy, greatly reducing energy consumption.

[0057] In some embodiments of this application, the second heat exchange device 6 includes a cooling tower (not shown in the figure) and a booster pump (not shown in the figure). The booster pump is used to pump the second heat exchange liquid to the top of the cooling tower, and the cooling tower is used to increase the contact area between the second heat exchange liquid and the air, so that the second heat exchange liquid and the air can exchange heat.

[0058] The booster pump is used to pump the second heat exchange liquid to the top of the cooling tower. The cooling tower is equipped with multiple through holes, through which the second heat exchange liquid flows down, forming multiple water streams. This increases the contact area between the second heat exchange liquid and the air, thereby using cold air to cool the second heat exchange liquid and reduce energy consumption.

[0059] In some embodiments of this application, the second heat exchange liquid is water.

[0060] Water has a thermal conductivity of approximately 0.6 W / (m*k). Using water as a heat exchange liquid offers both high heat exchange efficiency and cost savings.

[0061] It is understood that in some other embodiments of this application, the second heat exchange liquid may also be other liquids.

[0062] In some embodiments of this application, the first heat exchange liquid is a 50% aqueous solution of ethylene glycol.

[0063] A 100% aqueous solution of ethylene glycol has a thermal conductivity of approximately 0.25 W / (m*K), providing good antifreeze performance, but it is prone to corroding metal pipes (such as carbon steel and copper). Pure water has a higher thermal conductivity than ethylene glycol, but its antifreeze performance is poor. Using a 50% aqueous solution of ethylene glycol achieves a balance between antifreeze and thermal conductivity, with a thermal conductivity of approximately 0.45 W / (m*K), meeting the heat transfer efficiency requirements of liquid cooling systems and preventing localized overheating of the battery module due to insufficient thermal conductivity.

[0064] It is understood that in some other embodiments of this application, the first heat exchange liquid may also be other liquids.

[0065] In some embodiments of this application, the first heat exchange device 4 includes an air-cooling component for cooling the first heat exchange liquid.

[0066] During hot summer months, the temperature of the second coolant 3 in the second heat exchanger 6 is high, resulting in poor cooling of the first heat exchanger liquid. By installing an air-cooling assembly to provide forced air cooling for the first heat exchanger liquid, the heat dissipation effect on the battery cell module 2 can be improved.

[0067] In some examples, the air-cooled component uses an air conditioner, and the first heat exchange tube 5 in the first heat exchange device 4 is configured as a coil or serpentine structure. The air outlet of the air conditioner blows cold air out of the first heat exchange tube 5, thereby providing forced air-cooled auxiliary heat dissipation to the first heat exchange liquid.

[0068] The various embodiments or implementation methods described in this specification are presented in a progressive manner. Each embodiment focuses on the differences from other embodiments, and the same or similar parts between the embodiments can be referred to each other.

[0069] It should be noted that the terms "one embodiment," "embodiment," "exemplary embodiment," "some embodiments," etc., mentioned in the specification indicate that the described embodiment may include a specific feature, structure, or characteristic, but not every embodiment necessarily includes that specific feature, structure, or characteristic. Furthermore, such phrases do not necessarily refer to the same embodiment. Moreover, when a specific feature, structure, or characteristic is described in connection with an embodiment, implementing such a feature, structure, or characteristic in conjunction with other embodiments, whether explicitly described or not, is within the knowledge scope of those skilled in the art.

[0070] Finally, it should be noted that other embodiments of this application will readily conceive of by those skilled in the art upon consideration of the specification and practice of the application disclosed herein. This application is intended to cover any variations, uses, or adaptations of this application that follow the general principles of this application and include common knowledge or customary techniques in the art not disclosed herein, and is not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and alterations may be made without departing from its scope. The scope of this application is limited only by the appended claims.

Claims

1. A submersible fire protection system, characterized in that, include: Battery cell modules are used for energy storage; A cell container for accommodating the cell module, the cell container being filled with coolant, and the cell module being immersed in the coolant; A heat exchange system, comprising a first heat exchange device and a first heat exchange tube, wherein the first heat exchange tube is filled with a first heat exchange liquid, the first heat exchange device is located outside the battery cell container, and the first heat exchange device exchanges heat with the coolant through the first heat exchange tube.

2. The submersible fire protection system according to claim 1, characterized in that, The first heat exchange device is connected to multiple first heat exchange tubes connected in parallel. The number of the battery cell container matches the number of the first heat exchange tubes, and they are connected in a one-to-one correspondence.

3. The submersible fire protection system according to claim 1, characterized in that, The coolant is a supramolecular halogenated hydrocarbon compound.

4. The submersible fire protection system according to claim 1, characterized in that, It also includes a monitoring component, a battery management unit, a battery control unit, and an energy management system. The monitoring component is used to monitor the temperature of the cell module and the level of the coolant. The monitoring component is electrically connected to the battery management unit, the battery control unit, and the energy management system.

5. The submersible fire protection system according to claim 4, characterized in that, The monitoring component includes an ultrasonic level detector, which is disposed inside the cell container and is used to measure the level of the coolant.

6. The submersible fire protection system according to claim 4, characterized in that, The monitoring component includes a grating optical fiber with multiple grating temperature measurement points evenly spaced on it. The battery cell module includes multiple battery cells arranged in an array, and the grating optical fiber is wound around the poles of the multiple battery cells.

7. The submersible fire protection system according to claim 4, characterized in that, The battery control unit is connected to an audible and visual alarm device.

8. The submersible fire protection system according to any one of claims 1-7, characterized in that, The heat exchange system further includes a second heat exchange device and a second heat exchange tube. The second heat exchange device and the second heat exchange tube are filled with a second heat exchange liquid. The second heat exchange device exchanges heat with the first heat exchange liquid through the second heat exchange tube.

9. The submersible fire protection system according to claim 8, characterized in that, The second heat exchange device includes a cooling tower and a booster pump. The booster pump is used to pump the second heat exchange liquid to the top of the cooling tower. The cooling tower is used to increase the contact area between the second heat exchange liquid and the air, so that the second heat exchange liquid and the air can exchange heat. And / or, the second heat exchange liquid is water.

10. The submersible fire protection system according to any one of claims 1-7, characterized in that, The first heat exchange liquid is a 50% ethylene glycol aqueous solution; And / or, the first heat exchange device includes an air-cooling component for cooling the first heat exchange liquid.

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