Temperature detecting and fire extinguishing device for energy storage battery pack

Abstract

The invention relates to the technical field of safety protection of energy storage batteries, and particularly discloses a temperature detecting and fire extinguishing device for an energy storage battery pack, which comprises a fire extinguishing agent electromagnetic valve, a high-pressure gas electromagnetic valve, a pressure switch and a fire detecting tube, the fire extinguishing agent electromagnetic valve is arranged in the fire extinguishing agent pipeline, the high-pressure gas electromagnetic valve is arranged in the high-pressure gas pipeline, the tail ends of the fire extinguishing agent pipeline and the high-pressure gas pipeline are connected with the water-gas mixing spray head, the water-gas mixing spray head is connected with the fire detection pipe through the atomized gas guide pipe, and the pressure switch is arranged on the atomized gas guide pipe. The fire extinguishing agent solenoid valve is connected with the pressure switch through a solenoid valve wire, and the fire detection tube is inserted into the battery pack. A fire extinguishing agent and high-pressure gas are fully mixed at the water-gas mixing spray head to form atomized gas, a fire source can be rapidly covered, the temperature of the fire source is reduced, oxygen is isolated, and therefore efficient fire extinguishing is achieved. According to the invention, the fire risk of the lithium ion battery energy storage system can be effectively handled, and the safety performance of the system is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of energy storage battery safety protection, and in particular to a temperature detection and fire extinguishing device for an energy storage battery pack. Background Art

[0002] Energy storage systems, as auxiliary energy systems, can perform peak and frequency regulation, and provide emergency power backup, and have garnered increasing attention in recent years. Lithium-ion batteries are increasingly becoming the mainstream energy storage system, and operational safety is crucial. Compared to traditional lead-acid batteries, lithium-ion batteries have poorer thermal stability, posing a risk of fire due to overheating during operation.

[0003] In existing lithium-ion battery energy storage cabinet fire protection systems, the main temperature detection method is to use temperature sensors to determine whether the temperature has reached the set value. When the temperature reaches the set value, the fire control system sends a command to sound an alarm or activate the fire extinguishing device.

[0004] There are two main fire extinguishing methods. One is piped firefighting, where fire sprinklers are placed near the battery pack inside the cabinet. When a fire or alarm occurs, fire extinguishing agent is delivered from a cylinder through a pipe and sprayed out of the sprinklers, thereby cooling the fire and extinguishing the flames. Commonly used fire extinguishing agents include heptafluoropropane, perfluorohexanone, and water.

[0005] Another type of fire extinguishing system is an aerosol fire extinguishing system, which does not require fire extinguishing pipes. It works by installing an aerosol near the battery pack. When the temperature exceeds a critical value, the aerosol fire extinguishing system receives an electrical signal, triggering an internal reaction that sprays a flame-retardant aerosol spray, thereby cooling the battery and extinguishing the fire.

[0006] The disadvantage of duct-type and aerosol firefighting systems is that they cannot accurately determine the fire's location, resulting in less timely fire extinguishing. This is because duct-type and aerosol firefighting systems often use temperature sensors as their activation signal source. Temperature sensors can only detect the temperature at a specific location within an area and are therefore limited in their accuracy. Lithium battery fires don't originate at a specific location. When the fire is far from the temperature sensor, the firefighting system activates more slowly, making it difficult to control the fire in its initial stages.

[0007] In addition, the nozzles of pipe-type fire fighting and aerosol-type fire fighting are also single-point. When the distance from the fire point is far, the speed at which the fire extinguishing agent reaches the fire point is slow, which will also lead to a decrease in the fire extinguishing speed.

[0008] Therefore, a temperature detection and fire extinguishing device for energy storage battery packs has become an urgent problem to be solved. Summary of the Invention

[0009] The technical problem to be solved by the present invention is to provide a temperature detection and fire extinguishing device for an energy storage battery pack, which can timely detect temperature changes in the energy storage battery pack, quickly start when a fire occurs, efficiently extinguish the fire, and ensure the safe operation of the energy storage battery pack.

[0010] To solve the above technical problems, the present invention provides a technical solution: a temperature detection and fire extinguishing device for an energy storage battery pack, comprising a fire extinguishing agent solenoid valve, a high-pressure gas solenoid valve, a pressure switch, and a fire detection tube;

[0011] The fire extinguishing agent solenoid valve is arranged in the fire extinguishing agent pipeline, and the high-pressure gas solenoid valve is arranged in the high-pressure gas pipeline. The ends of the fire extinguishing agent pipeline and the high-pressure gas pipeline are connected to water-gas mixing nozzles. The water-gas mixing nozzle and the fire detection tube are connected through an atomizing gas conduit. The pressure switch is arranged on the atomizing gas conduit. The fire extinguishing agent solenoid valve is connected to the pressure switch through the solenoid valve wire, and the fire detection tube is inserted into the battery pack.

[0012] Furthermore, the front end of the fire extinguishing agent pipeline is connected to a fire extinguishing agent cylinder, and the fire extinguishing agent pipeline is also provided with a fire extinguishing agent pressure gauge.

[0013] Furthermore, a gas cylinder is provided at the front end of the high-pressure gas pipeline, and a high-pressure gas pressure gauge and a pressure reducing valve are also provided on the high-pressure gas pipeline.

[0014] Furthermore, the fire detection tube is located above the battery safety outlet in the battery pack, 0-5MPa auxiliary gas is injected into the fire detection tube, and a plug is provided at the end of the fire detection tube.

[0015] Furthermore, the fire detection temperature of the fire detection tube is 60-180°C.

[0016] Furthermore, the pressure switch is of a normally closed type, disconnected at high pressure and connected at pressure relief.

[0017] Furthermore, the pressure switch is a pressure control switch capable of adjusting high and low pressures, including digital control display, mechanical control, direct conduction and electronic signal control.

[0018] Furthermore, the fire extinguishing agent solenoid valve and the high-pressure gas solenoid valve are both normally closed solenoid valves, which are conductive when energized.

[0019] The advantages of the present invention over the prior art are that the present invention can sense the temperature changes in the battery pack in real time by directly inserting the fire detection tube into the battery pack. When the temperature reaches the fire detection temperature, the fire detection tube quickly breaks and sends a fire signal in time, thereby improving the timeliness of fire detection.

[0020] The present invention fully mixes the fire extinguishing agent and high-pressure gas at the water-gas mixing nozzle to form atomized gas, which can quickly cover the fire source, reduce the fire source temperature, and isolate oxygen, thereby effectively extinguishing the fire.

[0021] The pressure switch used in the present invention is a pressure control switch that can adjust high and low pressures. It has multiple control functions and can flexibly adjust the starting conditions of the fire extinguishing device according to actual conditions, thereby improving the applicability and reliability of the device.

[0022] The temperature detection and fire extinguishing device of the present invention has a simple structure, is easy to install, and has a low cost, and is convenient for wide application in energy storage battery packs.

[0023] The present invention can effectively address the fire risk of a lithium-ion battery energy storage system and improve the safety performance of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a structural schematic diagram of Example 1 of a temperature detection and fire extinguishing device for an energy storage battery pack of the present invention.

[0025] Figure 2 It is a structural schematic diagram of Example 2 of a temperature detection and fire extinguishing device for an energy storage battery pack of the present invention.

[0026] As shown in the figure: 1. Fire extinguishing agent solenoid valve, 2. High-pressure gas solenoid valve, 3. Pressure switch, 4. Fire detection tube, 5. Fire extinguishing agent pipeline, 6. High-pressure gas pipeline, 7. Water-gas mixing nozzle, 8. Atomizing gas conduit, 9. Solenoid valve wire, 10. Battery pack, 11. Fire extinguishing agent cylinder, 12. Fire extinguishing agent pressure gauge, 13. Gas cylinder, 14. High-pressure gas pressure gauge, 15. Pressure reducing valve, 16. Plug. DETAILED DESCRIPTION

[0027] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "inside", "outside", "vertical", "circumferential", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0028] In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connect," "fixed," etc. should be understood broadly. For example, they may refer to fixed connection, detachable connection, or integral connection; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; or internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0029] The temperature detection and fire extinguishing device for an energy storage battery pack of the present invention will be further described in detail below with reference to the accompanying drawings.

[0030] Combined with attachment Figure 1-2 , the present invention is introduced in detail.

[0031] A temperature detection and fire extinguishing device for an energy storage battery pack mainly comprises a fire extinguishing agent solenoid valve 1, a high-pressure gas solenoid valve 2, a pressure switch 3 and a fire detection tube 4.

[0032] The fire extinguishing agent solenoid valve 1 is arranged in the fire extinguishing agent pipeline 5, and the high-pressure gas solenoid valve 2 is arranged in the high-pressure gas pipeline 6. The front end of the fire extinguishing agent pipeline 5 is connected to the fire extinguishing agent cylinder 11 for storing the fire extinguishing agent; the front end of the high-pressure gas pipeline 6 is provided with a gas cylinder 13 for storing the high-pressure gas. The fire extinguishing agent pipeline 5 is also provided with a fire extinguishing agent pressure gauge 12 for monitoring the pressure in the fire extinguishing agent pipeline 5; the high-pressure gas pipeline 6 is also provided with a high-pressure gas pressure gauge 14 and a pressure reducing valve 15. The high-pressure gas pressure gauge 14 is used to monitor the pressure in the high-pressure gas pipeline 6, and the pressure reducing valve 15 is used to adjust the pressure of the high-pressure gas to ensure that it is stable within an appropriate range. The fire extinguishing agent solenoid valve 1 and the high-pressure gas solenoid valve 2 are both normally closed solenoid valves, which are turned on when energized and connected to the pressure switch 3 through the solenoid valve wire 9. The pressure switch 3 controls their on and off.

[0033] The ends of the fire extinguishing agent pipeline 5 and the high-pressure gas pipeline 6 are connected to a water-gas mixing nozzle 7, which is connected to the fire detection tube 4 through an atomizing gas conduit 8. This design allows the fire extinguishing agent and high-pressure gas to be fully mixed at the water-gas mixing nozzle 7 to form atomized gas, thereby improving the fire extinguishing effect.

[0034] The fire detection tube 4 is inserted into the battery pack 10, located above the battery safety outlet. 0-5 MPa of auxiliary gas is injected into the fire detection tube 4, and a plug 16 is provided at the end of the fire detection tube 4. The fire detection temperature of the fire detection tube 4 is 60-180°C. When the temperature inside the battery pack 10 rises to the fire detection temperature of the fire detection tube 4, the fire detection tube 4 ruptures, releasing the auxiliary gas, causing the pressure in the atomizing gas conduit 8 to change.

[0035] Pressure switch 3, located on atomizing gas conduit 8, is a normally closed switch, disconnected for high pressure and connected for pressure relief. Furthermore, this pressure switch 3 is a pressure-controlled switch capable of adjusting high and low pressures, including digital control and display, mechanical control, direct conduction, and electronic signal control. When the fire detection tube 4 ruptures, causing a pressure change within the atomizing gas conduit 8, pressure switch 3 detects the pressure change and activates, thereby energizing the fire extinguishing agent solenoid valve 1 and the high-pressure gas solenoid valve 2. This allows the fire extinguishing agent and high-pressure gas to be sprayed through the water-gas mixing nozzle 7, extinguishing the fire.

[0036] The specific implementation process of the temperature detection and fire extinguishing device for energy storage battery packs of the present invention is as follows:

[0037] Example 1

[0038] The fire detection tube 4 is installed above the safety valve in the battery pack 10 inside the energy storage cabinet, and the pressure switch 3 is installed behind the water-gas mixing nozzle 7 and at the front end of the fire detection tube 4.

[0039] Before the fire detection tube 4 is broken, the pressure switch 3 is in a high-pressure state. At this time, the pressure switch 3 is disconnected and the fire extinguishing agent solenoid valve 1 is in a closed state.

[0040] When the battery's fire protection system detects an early warning from the energy storage system battery, it automatically opens high-pressure gas solenoid valve 2. When the pressure reaches the high-pressure state of pressure switch 3, it opens fire extinguishing agent solenoid valve 1. At this point, the battery surface temperature has not reached the rupture temperature of fire detection tube 4, and fire detection tube 4 is in a high-pressure state. Pressure switch 3 is in the open state. Fire extinguishing agent solenoid valve 1 is not energized and is closed.

[0041] After the fire detection tube 4 ruptures, the pressure switch 3 is in a low-pressure state. At this time, the pressure switch 3 is turned on, and the fire extinguishing agent solenoid valve 1 is turned on. The fire extinguishing agent is sprayed onto the battery surface under the push of high-pressure gas.

[0042] Example 2

[0043] The fire extinguishing agent is stored in a fire extinguishing agent cylinder 11 and is pressurized to a specified pressure using inert gas. It then enters the liquid inlet of the water-gas mixing nozzle 7 through the fire extinguishing agent pressure gauge 12 and the fire extinguishing agent solenoid valve 1. High-pressure gas is stored in a high-pressure gas cylinder 13 and enters the gas inlet of the water-gas mixing nozzle 7 through the pressure reducing valve 15 and the high-pressure gas solenoid valve 2. The high-pressure gas pipeline 6 delivers the fire extinguishing agent to the water-gas mixing nozzle 7. The fire extinguishing agent is controlled by the fire extinguishing agent solenoid valve 1 and the high-pressure gas solenoid valve 2 installed in the high-pressure gas pipeline 6. The fire extinguishing agent solenoid valve 1 is controlled to be on and off by the pressure switch 3 installed behind the nozzle and in front of the fire detection tube 4. When the fire detection tube 4 is not ruptured, the pressure switch 3 is in a high-pressure state and the fire extinguishing agent solenoid valve 1 is disconnected. After the fire detection tube 4 is ruptured, the pressure switch 3 is in a low-pressure state and the fire extinguishing agent solenoid valve 1 is connected.

[0044] The present invention and its embodiments are described above. This description is not restrictive. The drawings show only one embodiment of the present invention, and the actual structure is not limited thereto. In short, if a person skilled in the art is inspired by this and, without departing from the purpose of the present invention, designs structures and embodiments similar to this technical solution without inventiveness, they shall fall within the scope of protection of the present invention.

Claims

1. A temperature detection and fire extinguishing device for an energy storage battery pack, characterized in that: It comprises a fire extinguishing agent electromagnetic valve (1), a high-pressure gas electromagnetic valve (2), a pressure switch (3) and a fire detection tube (4); The fire extinguishing agent solenoid valve (1) is arranged in the fire extinguishing agent pipeline (5), the high-pressure gas solenoid valve (2) is arranged in the high-pressure gas pipeline (6), the ends of the fire extinguishing agent pipeline (5) and the high-pressure gas pipeline (6) are connected with a water-gas mixing nozzle (7), the water-gas mixing nozzle (7) and the fire detection tube (4) are connected through an atomizing gas conduit (8), the pressure switch (3) is arranged on the atomizing gas conduit (8), the fire extinguishing agent solenoid valve (1) is connected to the pressure switch (3) through a solenoid valve wire (9), and the fire detection tube (4) is inserted into the battery pack (10).

2. A temperature detection and fire extinguishing device for an energy storage battery pack according to claim 1, characterized in that: The front end of the fire extinguishing agent pipeline (5) is connected to a fire extinguishing agent cylinder (11), and a fire extinguishing agent pressure gauge (12) is also provided on the fire extinguishing agent pipeline (5).

3. A temperature detection and fire extinguishing device for an energy storage battery pack according to claim 2, characterized in that: A gas cylinder (13) is provided at the front end of the high-pressure gas pipeline (6), and a high-pressure gas pressure gauge (14) and a pressure reducing valve (15) are also provided on the high-pressure gas pipeline (6).

4. A temperature detection and fire extinguishing device for an energy storage battery pack according to claim 3, characterized in that: The fire detection tube (4) is located above the battery safety outlet in the battery pack (10), 0-5 MPa auxiliary gas is injected into the fire detection tube (4), and a plug (16) is provided at the end of the fire detection tube (4).

5. A temperature detection and fire extinguishing device for an energy storage battery pack according to claim 4, characterized in that: The fire detection temperature of the fire detection tube (4) is 60-180°C.

6. A temperature detection and fire extinguishing device for an energy storage battery pack according to claim 5, characterized in that: The pressure switch (3) is a normally closed type, disconnected at high pressure and connected at pressure relief.

7. A temperature detection and fire extinguishing device for an energy storage battery pack according to claim 6, characterized in that: The pressure switch (3) is a pressure control switch capable of regulating high and low pressures, including digital control display, mechanical control, direct conduction and electronic signal control.

8. The temperature detection and fire extinguishing device for an energy storage battery pack according to claim 7, characterized in that: The fire extinguishing agent solenoid valve (1) and the high-pressure gas solenoid valve (2) are both normally closed solenoid valves and are conductive when energized.

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