A lithium battery liquid-cooled fire-fighting circulation system and its use method

Abstract

The present invention relates to the field of lithium battery fire protection technology, and specifically discloses a lithium battery liquid-cooled fire protection circulation system and a use method thereof, wherein the lithium battery liquid-cooled fire protection circulation system comprises a sealed box storing an insulating liquid and internally provided with a pressure sensor and a temperature sensor, a liquid circulation pipeline connected to the sealed box, and an exhaust pipeline respectively connected to the liquid circulation pipeline and the sealed box; and discloses a specific use method thereof; the present invention can effectively achieve cooling of lithium batteries, and when a battery fire occurs, can quickly cool the battery and quickly extinguish the fire; can continuously cool the battery to prevent the battery from reigniting, and can also effectively prevent the battery from burning and exploding.

Description

Technical Field

[0001] The present invention relates to the field of lithium battery fire protection technology, and more particularly to a lithium battery liquid-cooled fire protection circulation system and a method of use. Background Art

[0002] With the increasing scale of renewable energy power generation and the continuous development of electrochemical energy storage technology, lithium battery energy storage systems have ushered in explosive growth; however, lithium batteries are at risk of thermal runaway, which can cause battery combustion and explosion.

[0003] There are many causes of battery thermal runaway, which can be categorized as mechanical abuse, electrical abuse, and thermal abuse. These three types of abuse share the common characteristic of causing micro-shorts within lithium batteries. These micro-shorts generate heat within the battery, which accumulates and causes structural breakdown (rapid decomposition of battery materials, releasing flammable, toxic, and oxygen gases), ultimately leading to thermal runaway and even combustion and explosion.

[0004] Existing lithium battery firefighting technology primarily focuses on extinguishing fires after they occur, but cannot prevent them. Heptafluoropropane and perfluorohexanone fire extinguishers can quickly extinguish initial battery fires, but after the spraying stops, the battery still retains energy and heat, allowing continued thermal decomposition and potentially reigniting the fire. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a lithium battery liquid cooling fire protection circulation system and a method of use; it can effectively achieve battery cooling, and when a battery fire occurs, it can quickly cool the battery and quickly extinguish the fire; it can continuously cool the battery to prevent the battery from reigniting, and can also effectively prevent the battery from burning and exploding.

[0006] The solution adopted by the present invention to solve the technical problem is:

[0007] A lithium battery liquid-cooled fire protection circulation system comprises a sealed box storing insulating liquid and internally provided with a pressure sensor and a temperature sensor, a liquid circulation pipeline connected to the sealed box, and an exhaust pipeline respectively connected to the liquid circulation pipeline and the sealed box.

[0008] The pressure sensor and temperature sensor are used to detect the pressure and temperature inside the sealed box;

[0009] Under normal operation, the insulating liquid in the sealed box is cooled through the liquid circulation pipeline, and then enters the sealed box again to cool the battery, effectively preventing the occurrence of battery fire;

[0010] When the battery temperature rises abnormally, the temperature sensor detects that the insulating liquid temperature has reached the boiling point and starts the exhaust pipeline. On the one hand, it cools the evaporated insulating liquid and allows it to re-enter the sealed box through the liquid circulation pipeline. On the other hand, the exhaust pipeline will also discharge the combustible gas, oxygen and other gases produced by the thermal decomposition of the battery in this case, to prevent the combustible gas and oxygen from accumulating in the sealed box and causing explosion.

[0011] In some possible implementations, in order to effectively condense the evaporated insulating liquid and re-enter the sealed box;

[0012] The exhaust pipeline includes an air pipe connected to the top of the sealed box and a condenser installed on the air pipe; the other end of the air pipe is connected to the liquid circulation pipeline.

[0013] In some possible implementations, in order to effectively avoid the accumulation of combustible gas and oxygen, which may cause combustion and explosion of the battery;

[0014] The air pipe is also provided with an exhaust solenoid valve and a liquid collecting tank connected to one end of the air pipe away from the sealing box and connected to the liquid circulation pipeline. The exhaust solenoid valve is provided between the condenser and the liquid collecting tank.

[0015] In some possible implementations, in order to effectively achieve air pressure protection;

[0016] A pressure relief valve is provided on the liquid collecting tank.

[0017] In some possible implementations, a branch line 1 is further provided on the air pipe, a solenoid valve 1 is provided on the branch line 1, and the other end of the branch line 1 is connected to the liquid circulation pipeline; a solenoid valve 2 is provided between the connection point between the branch line 1 and the liquid circulation pipeline and the pump.

[0018] In some possible implementations, in order to effectively enable the insulating liquid after condensation to enter the sealed box again, the insulating liquid can be recycled and the consumption of the insulating liquid during use can be reduced;

[0019] The liquid circulation pipeline includes a liquid pipeline with both ends respectively connected to the sealing box, a heat exchanger arranged on the liquid pipeline, and a pump installed on the liquid pipeline; the heat exchanger is located between the inlet of the liquid pipeline and the pump.

[0020] In some possible implementations, there are multiple sealed boxes, each of which is provided with a liquid inlet branch connected to the inlet of the liquid circulation pipeline, a solenoid valve 3 connected to the outlet of the liquid circulation pipeline, and an air intake branch connected to the inlet of the exhaust pipeline.

[0021] On the other hand, the present invention discloses a method for using a lithium battery liquid cooling fire protection circulation system. Under normal circumstances, the exhaust pipe is closed and the liquid circulation pipe is opened. The insulating liquid is cooled in the liquid cooling pipe and then re-enters the sealed box to cool the battery.

[0022] Under abnormal circumstances, when the pressure sensor and temperature sensor detect that the temperature and pressure in the sealed box increase and reach the set value, the exhaust pipe is opened, and the gas generated by battery pyrolysis is discharged through the exhaust pipe. The evaporated insulating liquid will condense in the exhaust pipe and then pass through the liquid circulation pipe to re-enter the sealed box to cool the battery.

[0023] In some possible implementations, the exhaust pipe is opened, and the gas generated by battery pyrolysis is discharged through the exhaust pipe. The evaporated insulating liquid condenses in the exhaust pipe and then passes through the liquid circulation pipe to re-enter the sealed box to cool the battery. Specifically,

[0024] Open solenoid valve 1 and the exhaust solenoid valve, and close solenoid valve 2; the gas generated by battery pyrolysis is discharged through the exhaust pipe and the exhaust solenoid valve, and the evaporated insulating liquid passes through the heat exchanger and condenser into the liquid collecting tank, and is then transported to the sealed box again through the pump.

[0025] In some possible implementations, under normal circumstances, closing the exhaust pipeline and opening the liquid circulation pipeline specifically refers to: closing the first solenoid valve and the exhaust solenoid valve, and opening the second solenoid valve.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] The present invention, through the interaction between the liquid circulation pipeline and the exhaust pipeline, can prevent battery fires on the one hand, and can also effectively solve the risk of insulating liquid leakage and sealing box explosion caused by the increase of sealing box pressure due to evaporation of insulating liquid on the other hand.

[0028] The present invention effectively solves the problem of accumulation of combustible gas and oxygen generated by thermal decomposition of the battery through the exhaust pipeline, thereby avoiding combustion and explosion of the battery; and can condense and recover the evaporated insulating liquid, so that it can enter the sealed box again through the liquid circulation pipeline for use, effectively avoiding the problem of insulating liquid consumption during use;

[0029] The invention has a simple structure and strong practicability. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a structural schematic diagram of the present invention;

[0031] Figure 2 Schematic diagram of the connection relationship when there are multiple sealed boxes in the present invention;

[0032] Among them: 1. Pump; 2. Liquid circulation pipeline; 3. Solenoid valve three; 4. Solenoid valve one; 5. Solenoid valve two; 6. Heat exchanger; 7. Air pipe; 8. One-way valve; 9. Condenser; 10. Exhaust solenoid valve; 11. Pressure relief valve; 12. Liquid collecting tank; 13. Insulating liquid; 14. Sealing box; 15. Pressure sensor; 16. Temperature sensor; 17. Fire controller. DETAILED DESCRIPTION

[0033] In this application, unless otherwise specified or limited, terms such as "mounted," "connected," "connect," and "fixed" should be interpreted broadly. For example, they can refer to fixed connections, removable connections, or integration; they can refer to direct connections or indirect connections through an intermediary; they can refer to internal communication between two components or interactions between two components. The terms "first," "second," and similar terms mentioned in this application do not denote any order, quantity, or importance; they are simply used to distinguish between different components. Similarly, terms such as "one" or "a" do not indicate a quantitative limitation; rather, they indicate the presence of at least one. In the implementation of this application, "and / or" describes an association relationship between associated objects, indicating that three possible relationships exist. For example, "A and / or B" can mean: A exists alone, A and B exist simultaneously, or B exists alone. In the description of the embodiments of this application, unless otherwise specified, "plurality" means two or more. For example, "plurality" refers to two or more positioning posts. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.

[0034] The present invention is described in detail below.

[0035] like Figure 1 、 Figure 2 As shown:

[0036] A lithium battery liquid-cooled fire protection circulation system includes a sealed box 14 storing an insulating liquid 13 and internally provided with a pressure sensor 15 and a temperature sensor 16, a liquid circulation pipeline 2 connected to the sealed box 14, and an exhaust pipeline respectively connected to the liquid circulation pipeline 2 and the sealed box 14.

[0037] The pressure sensor 15 and the temperature sensor 16 are used to detect the pressure and temperature in the sealed box 14; the battery will be installed in the sealed box 14 and submerged in the insulating liquid 13; the pressure sensor 15 is installed on the inner side of the top of the sealed box 14 to monitor the pressure in the sealed box 14 in real time; the temperature sensor 16 is located in the insulating liquid 13 to monitor the temperature of the insulating liquid 13 in real time

[0038] Under normal operation, the insulating liquid 13 in the sealed box 14 is cooled by the liquid circulation pipeline 2, and then enters the sealed box 14 again to cool the battery, effectively preventing the occurrence of battery fire;

[0039] When the battery temperature rises abnormally, the temperature sensor 16 detects that the temperature of the insulating liquid 13 has reached the boiling point and starts the exhaust pipeline. On the one hand, it cools the evaporated insulating liquid 13 and allows it to re-enter the sealed box 14 through the liquid circulation pipeline. On the other hand, the exhaust pipeline will also discharge the combustible gas, oxygen and other gases produced by the thermal decomposition of the battery in this case, so as to prevent the combustible gas and oxygen from accumulating in the sealed box 14 and causing explosion.

[0040] Preferably, the insulating liquid 13 can be any one of fluorinated liquid, perfluorohexanone, insulating mineral oil, and transformer oil;

[0041] In some possible implementations, in order to effectively condense the evaporated insulating liquid 13 and re-enter the sealed box 14;

[0042] The exhaust pipeline includes an air pipe 7 connected to the top of the sealing box 14 and a condenser 9 installed on the air pipe 7; the other end of the air pipe 7 is connected to the liquid circulation pipeline 2.

[0043] In some possible implementations, in order to effectively avoid the accumulation of combustible gas and oxygen, which may cause combustion and explosion of the battery;

[0044] The air pipe 7 is also provided with an exhaust solenoid valve 10 and a liquid collecting tank 12 connected to the end of the air pipe 7 away from the sealing box 14 and connected to the liquid circulation pipeline 2. The exhaust solenoid valve 10 is provided between the condenser 9 and the liquid collecting tank 12.

[0045] In some possible implementations, in order to effectively achieve air pressure protection;

[0046] A pressure relief valve 11 is provided on the liquid collecting tank 12 .

[0047] In some possible embodiments, a branch line 1 is further provided on the air pipe 7, a solenoid valve 1 4 is provided on the branch line 1, the other end of the branch line 1 is connected to the liquid circulation pipeline 2, and a solenoid valve 2 5 is provided between the connection point between the branch line 1 and the liquid circulation pipeline 2 and the pump 1; the solenoid valve 2 5 is installed on the liquid circulation pipeline 2.

[0048] In some possible implementations, in order to effectively enable the condensed insulating liquid 13 to enter the sealed box 14 again, the insulating liquid 13 can be recycled and the consumption of the insulating liquid 13 during use can be reduced;

[0049] The liquid circulation pipeline 2 includes a liquid pipeline connected to the sealing box 14 at both ends, a heat exchanger 6 arranged on the liquid pipeline, and a pump 1 installed on the liquid pipeline; the heat exchanger 6 is located between the inlet of the liquid pipeline and the pump 1.

[0050] In some possible embodiments, there are multiple sealed boxes 14, and each sealed box 14 is provided with a liquid inlet branch connected to the inlet of the liquid circulation pipeline 2, a solenoid valve 3 connected to the outlet of the liquid circulation pipeline 2, and an air intake branch connected to the inlet of the exhaust pipeline.

[0051] On the other hand, the present invention discloses a method for using a lithium battery liquid cooling fire protection circulation system. Under normal circumstances, the exhaust pipe is closed and the liquid circulation pipe 2 is opened. The insulating liquid 13 is cooled in the liquid cooling pipe and then enters the sealed box 14 again to cool the battery.

[0052] Under abnormal circumstances, when the pressure sensor 15 and the temperature sensor 16 detect that the temperature and pressure in the sealed box 14 increase and reach the set value, the exhaust pipe is opened, and the gas generated by the thermal decomposition of the battery is discharged through the exhaust pipe. The evaporated insulating liquid 13 will condense in the exhaust pipe and then pass through the liquid collecting tank 12 to the liquid circulation pipe 2 to re-enter the sealed box 14 to cool the battery.

[0053] In some possible embodiments, the exhaust pipe is opened, and the gas generated by battery pyrolysis is discharged through the exhaust pipe. The evaporated insulating liquid 13 will condense in the exhaust pipe and then pass through the liquid circulation pipe 2 to re-enter the sealed box 14 to cool the battery. Specifically,

[0054] Open solenoid valve 1 4 and exhaust solenoid valve 10, and close solenoid valve 2 5; the gas generated by battery pyrolysis is discharged through the exhaust pipe and exhaust solenoid valve 10, and the evaporated insulating liquid 13 passes through the heat exchanger 6 and the condenser 9 and enters the liquid collecting tank 12, and is then transported to the sealing box 14 again through the pump 1.

[0055] In some possible implementations, under normal circumstances, the exhaust pipeline is closed and the liquid circulation pipeline 2 is opened, which specifically means: closing the solenoid valve 1 4 and the exhaust solenoid valve 10 , and opening the solenoid valve 2 5 .

[0056] Preferably, a fire controller 17 is also included. The fire controller 17 receives the pressure and temperature data in the sealed box 14 in real time, makes judgments on the data, and controls the solenoid valve 4 and the exhaust solenoid valve 10 to open if there is an abnormality.

[0057] Example 1:

[0058] In this embodiment, there is only one sealed box 14, the inlet of the exhaust pipe is located at the top of the sealed box 14 and communicates with the interior of the sealed box 14, and the inlet of the liquid circulation pipe 2 is located on the side arm of the sealed box 14 and communicates with the interior;

[0059] Under normal circumstances, the exhaust solenoid valve 10 and the solenoid valve 1 4 are closed, and the solenoid valve 2 5 is open. The insulating liquid 13 is cooled through the liquid circulation pipeline 2 and then enters the sealing box 14 again after cooling, thereby cooling the battery and avoiding fire.

[0060] Under abnormal conditions, the battery temperature rises abnormally. When the temperature reaches the boiling point of the insulating liquid 13, the insulating liquid 13 will evaporate into gas. At the same time, the battery thermal decomposition will generate gas, which will increase the pressure in the sealed box 14. At this time, the exhaust solenoid valve 10 and the solenoid valve 1 4 are controlled to be open, and the solenoid valve 2 5 is closed. The gas will enter the exhaust pipeline and be cooled by the condenser 9. The exhaust solenoid valve 10 is opened to discharge the gas generated by the thermal decomposition. After cooling, the insulating liquid 13 enters the liquid collecting tank 12 and is then transported to the sealed box 14 again by the pump 1. At the same time, the unevaporated insulating liquid 13 will be cooled by the heat exchanger 6 and then transported to the sealed box 14 again by the pump 1. This ensures that the insulating hot liquid and the gas generated by evaporation can be recycled.

[0061] The gas generated by the thermal decomposition of the battery is discharged into the air through the exhaust solenoid valve 10 to avoid the accumulation of combustible gas and oxygen, which may cause the battery to burn and explode; the evaporated insulating liquid 13 re-enters the liquid cooling circulation system through the condenser 9 to avoid the rapid loss of the insulating liquid 13, ensure the continuous heat dissipation of the battery, and prevent the battery from re-igniting.

[0062] Example 2:

[0063] In this embodiment, there are multiple sealed boxes 14, and each sealed box 14 is provided with an exhaust branch connected to the exhaust pipeline, a discharge pipeline connected to the inlet of the liquid circulation pipeline 2, and a liquid inlet branch connected to the outlet of the liquid circulation pipeline 2; and a solenoid valve 3 is provided on the liquid inlet branch.

[0064] The setting of the solenoid valve three 3 is such that when an abnormality occurs in a certain sealed box 14, the solenoid valve three 3 is opened, and the evaporated insulating liquid 13 gas will be condensed in the condenser 9 and then returned to the corresponding sealed box 14 through the pump 1; the other solenoid valves three 3 will be in the closed state at this time.

[0065] Preferably, a one-way valve 8 is provided on the exhaust branch, and the flow direction of the evaporated insulating liquid is controlled by the one-way valve; when the battery in a sealed box 14 among multiple sealed boxes 14 is abnormally heated, the one-way valve 8 corresponding to it is controlled to open, and the one-way valves 8 corresponding to other sealed boxes 14 are in a closed state, so that the gas in the sealed box 14 can enter the condenser 9.

[0066] The present invention is not limited to the aforementioned specific embodiments, but extends to any new features or any new combination disclosed in this specification, as well as any new method or process steps or any new combination disclosed.

Claims

1. A lithium battery liquid cooling fire protection circulation system, characterized in that: It includes a sealed box storing insulating liquid and provided with a pressure sensor and a temperature sensor inside, a liquid circulation pipeline connected to the sealed box, and an exhaust pipeline connected to the liquid circulation pipeline and the sealed box respectively; The exhaust pipeline includes an air pipe connected to the top of the sealed box and a condenser installed on the air pipe; the other end of the air pipe is connected to the liquid circulation pipeline; the air pipe is also provided with an exhaust solenoid valve, a liquid collecting tank connected to the end of the air pipe away from the sealed box and connected to the liquid circulation pipeline, and the exhaust solenoid valve is arranged between the condenser and the liquid collecting tank; the air pipe is also provided with a branch line 1, a solenoid valve 1 is arranged on the branch line 1, and the other end of the branch line 1 is connected to the liquid circulation pipeline; a solenoid valve 2 is provided between the connection point between the branch line 1 and the liquid circulation pipeline and the pump; Under normal circumstances, the exhaust solenoid valve and solenoid valve 1 are in the closed state, and solenoid valve 2 is open. The insulating liquid will be cooled through the liquid circulation pipeline and enter the sealing box again after cooling; Under abnormal conditions, the battery temperature rises abnormally. When the temperature reaches the boiling point of the insulating liquid, the insulating liquid will evaporate into gas. At the same time, the battery thermal decomposition will produce gas, which will increase the pressure in the sealed box. The exhaust solenoid valve and solenoid valve one are controlled to open, and solenoid valve two is closed. The gas will enter the exhaust pipe and be cooled through the condenser. The exhaust solenoid valve is opened to discharge the gas produced by thermal decomposition. After cooling, the insulating liquid enters the liquid collecting tank and is then transported to the sealed box again by the pump.

2. A lithium battery liquid cooling fire fighting circulation system according to claim 1, characterized in that: A pressure relief valve is provided on the liquid collecting tank.

3. A lithium battery liquid cooling fire protection circulation system according to claim 1, characterized in that: The liquid circulation pipeline includes a liquid pipeline with both ends respectively connected to the sealing box, a heat exchanger arranged on the liquid pipeline, and a pump installed on the liquid pipeline; the heat exchanger is located between the inlet of the liquid pipeline and the pump.

4. A lithium battery liquid cooling fire fighting circulation system according to any one of claims 1 to 3, characterized in that: There are multiple sealed boxes, each of which is provided with a liquid inlet branch connected to the inlet of the liquid circulation pipeline, a solenoid valve 3 connected to the outlet of the liquid circulation pipeline, and an air intake branch connected to the inlet of the exhaust pipeline.

5. A method for using a lithium battery liquid-cooled firefighting circulation system according to any one of claims 1 to 4, characterized in that: Under normal circumstances, the exhaust pipe is closed and the liquid circulation pipe is opened. The battery is cooled by the insulating liquid in the liquid cooling pipe and then enters the sealed box again. Under abnormal circumstances, when the pressure sensor and temperature sensor detect that the temperature and pressure in the sealed box increase and reach the set value, the exhaust pipe is opened, and the gas generated by battery pyrolysis is discharged through the exhaust pipe. The evaporated insulating liquid will condense in the exhaust pipe and then pass through the liquid circulation pipe to re-enter the sealed box to cool the battery.

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