Battery pack container fire extinguishing system equipped with liquid nitrogen production device

Abstract

The utility model discloses a kind of battery pack container fire-fighting systems equipped with liquid nitrogen production device, including liquid nitrogen production device, nitrogen supply pipeline and liquid nitrogen supply pipeline;The liquid nitrogen production device includes PSA nitrogen generation system, nitrogen storage tank, stirling refrigerator and liquid nitrogen storage tank connected in sequence, and the stirling refrigerator is connected with water chiller;The PSA nitrogen generation system includes 1 air compressor, 1 cold dryer, 1 PSA nitrogen generator, several filters and gas storage tank;The nitrogen storage tank and liquid nitrogen storage tank are connected with battery pack container respectively by nitrogen supply pipeline and liquid nitrogen supply pipeline with battery pack container connection.The utility model can be under the condition that only air nitrogen source is used, on the one hand, nitrogen supply pipeline is used to maintain inert environment for battery pack container, on the other hand, liquid nitrogen supply pipeline is used to transport liquid nitrogen quickly when battery pack is abnormal, with the advantages of environmental protection, rapid response, simple operation and the like.

Description

Technical Field

[0001] This utility model relates to the field of cryogenic technology, and in particular to a battery pack container fire protection system equipped with a liquid nitrogen production device. Background Technology

[0002] With the rapid development of new energy technologies, battery packs, as core energy storage components, are widely used in various scenarios, and battery pack containers have become an important part of large-scale energy storage systems. However, due to the chemical characteristics of batteries, thermal runaway may occur under abnormal conditions such as overcharging, short circuits, or high temperatures, leading to fires or even explosions. This not only threatens personnel safety but may also result in huge economic losses. Therefore, designing an efficient and reliable fire protection system for battery pack containers is particularly important.

[0003] A robust fire suppression system can promptly detect initial fire signals and quickly implement firefighting measures, effectively containing the spread of fire, protecting equipment and personnel, reducing environmental hazards, and ensuring the stable operation and long-term reliability of the energy storage system. Furthermore, fire protection design that complies with relevant safety standards and regulations is also a prerequisite for project acceptance and commercial operation. In short, the rational planning and implementation of a fire protection system for battery pack containers is a crucial aspect of ensuring the safety of the entire energy storage facility.

[0004] Chinese patent document CN113437428A discloses a high-fire-safety energy storage battery pack and energy storage battery container. The energy storage battery pack includes a shell, several battery cells, a battery management system, and a fire-fighting device; the battery cells are located inside the battery pack and are connected together in series and / or parallel; the battery management system manages and controls the battery system; the fire-fighting device is installed inside the battery pack and is an aerosol fire extinguishing device; the aerosol fire extinguishing device includes a trigger and a fire extinguishing agent, the battery management system controls whether the trigger is activated, and the fire extinguishing agent is activated under the trigger activation condition to generate an aerosol with fire extinguishing effect.

[0005] Although aerosol fire extinguishing can extinguish fires by isolating oxygen, the cooling effect during the extinguishing process is not significant, and it also has an impact on the environment. Utility Model Content

[0006] This utility model provides a battery pack container fire protection system equipped with a liquid nitrogen production device. It can maintain an inert environment for the battery pack container by means of nitrogen supply pipelines using only the nitrogen source in the air, and can also quickly supply liquid nitrogen in case of battery pack malfunction by means of liquid nitrogen supply pipelines. It has the advantages of being environmentally friendly, having a rapid response, and being easy to operate.

[0007] A fire-fighting system for a battery pack container equipped with a liquid nitrogen production device includes the liquid nitrogen production device, a nitrogen supply pipeline, and a liquid nitrogen supply line.

[0008] The liquid nitrogen production unit includes a PSA nitrogen generation system, a nitrogen storage tank, a Stirling refrigerator and a liquid nitrogen storage tank connected in sequence, and the Stirling refrigerator is connected to a chiller unit;

[0009] The nitrogen storage tank and liquid nitrogen storage tank are connected to the battery pack container via nitrogen supply pipelines and liquid nitrogen supply pipelines, respectively.

[0010] Furthermore, the PSA nitrogen generation system includes, in sequence, an air compressor, a Class C filter, a refrigerated dryer, a four-stage filter, an air storage tank, and a PSA nitrogen generator. Furthermore, the nitrogen supply pipeline starts from the nitrogen storage tank and sequentially connects to a manual nitrogen shut-off valve, a nitrogen pressure reducing valve, a nitrogen main check valve, and a nitrogen compartment check valve, ultimately reaching the battery pack container.

[0011] Furthermore, the nitrogen supply pipeline is equipped with a nitrogen safety valve between the nitrogen manual shut-off valve and the nitrogen pressure reducing valve.

[0012] Furthermore, the liquid nitrogen supply pipeline starts from the liquid nitrogen storage tank and connects in sequence to the liquid nitrogen manual shut-off valve, the liquid nitrogen main solenoid valve, and the liquid nitrogen tank-level solenoid valve, finally reaching the battery pack container.

[0013] Furthermore, the liquid nitrogen supply pipeline uses a vacuum-insulated pipeline between the liquid nitrogen manual shut-off valve and the liquid nitrogen main solenoid valve; and uses an insulated pipeline wrapped with insulation material between the liquid nitrogen main solenoid valve and the liquid nitrogen chamber solenoid valve; the insulation material is preferably polytetrafluoroethylene, fluoropolymer, or polyurethane foam.

[0014] Furthermore, the liquid nitrogen supply pipeline is equipped with a liquid nitrogen safety valve and an upstream exhaust solenoid valve between the liquid nitrogen manual shut-off valve and the liquid nitrogen main solenoid valve, and a downstream exhaust solenoid valve between the liquid nitrogen main solenoid valve and the liquid nitrogen compartment solenoid valve; the outlets of the upstream exhaust solenoid valve and the downstream exhaust solenoid valve are connected to the atmospheric environment or the battery pack container.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] 1. Environmentally friendly: The fire protection system of this utility model uses nitrogen in the air as raw material to deliver nitrogen gas and liquid nitrogen to the outside, which has the characteristics of being pollution-free and environmentally friendly.

[0017] 2. Rapid response: After the fire protection system receives an abnormal signal from the battery pack, the main solenoid valve and the compartment solenoid valve on the liquid nitrogen supply pipeline open rapidly, and the liquid nitrogen can quickly reach the container under the pressure of the storage tank, which has the characteristic of rapid response.

[0018] 3. Simple operation: The fire protection system of this utility model can automatically supply nitrogen to the battery pack container around the clock through the nitrogen supply pipeline. At the same time, it can automatically respond and release liquid nitrogen when it receives an abnormal signal from the battery pack. It has the advantages of high automation and simple operation. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0021] In the diagram: 1-PSA nitrogen generation system, 2-nitrogen storage tank, 3-Stirling chiller, 4-liquid nitrogen storage tank, 5-chiller unit, 6-nitrogen supply pipeline, 7-liquid nitrogen supply pipeline, 8-battery pack container, 61-nitrogen manual shut-off valve, 62-nitrogen safety valve, 63-nitrogen pressure reducing valve, 64-nitrogen main line check valve, 65-nitrogen chamber-level check valve, 71-liquid nitrogen manual shut-off valve, 72-liquid nitrogen safety valve, 73-upstream exhaust solenoid valve, 74-liquid nitrogen main line solenoid valve, 75-liquid nitrogen chamber-level solenoid valve, 76-downstream exhaust solenoid valve. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] It should be noted that, unless otherwise specified, the features in the following embodiments and implementation methods can be combined with each other.

[0024] like Figure 1 As shown, a battery pack container fire protection system equipped with a liquid nitrogen production device includes a liquid nitrogen production device, a nitrogen supply pipeline 6, and a liquid nitrogen supply pipeline 7.

[0025] The liquid nitrogen production unit includes a PSA nitrogen generation system 1, a nitrogen storage tank 2, a Stirling refrigerator 3, and a liquid nitrogen storage tank 4 connected in sequence; the Stirling refrigerator 3 is equipped with a water chiller unit 5, and the liquid nitrogen storage tank 4 has a self-pressurization capability.

[0026] The PSA nitrogen generation system 1 includes an air compressor, a C-stage filter, a refrigerated dryer, a four-stage filter, an air storage tank, and a PSA nitrogen generator connected in sequence.

[0027] Nitrogen storage tank 2 and liquid nitrogen storage tank 4 are connected to each battery pack container 8 via nitrogen supply pipeline 6 and liquid nitrogen supply pipeline 7, respectively.

[0028] The nitrogen supply pipeline 6 starts from the nitrogen storage tank 2 and connects sequentially to the following valves: nitrogen manual shut-off valve 61, nitrogen safety valve 62, nitrogen pressure reducing valve 63, nitrogen main check valve 64, and nitrogen chamber-level check valve 65, finally reaching the battery pack container 8. When there are multiple battery pack containers 8, each battery pack container 8 is equipped with a corresponding nitrogen chamber-level check valve 65. Furthermore, a pressure sensor is installed before and after the nitrogen pressure reducing valve 63.

[0029] The fire protection system continuously supplies nitrogen to the battery pack container 8 through the nitrogen supply pipeline 6 to maintain the inert environment inside the container.

[0030] The liquid nitrogen supply pipeline 7 starts from the liquid nitrogen storage tank 4 and connects sequentially to the liquid nitrogen manual shut-off valve 71, the liquid nitrogen main solenoid valve 74, and the liquid nitrogen chamber-level solenoid valve 75, finally reaching the battery pack container 8. When there are multiple battery pack containers 8, each battery pack container 8 is equipped with a corresponding liquid nitrogen chamber-level solenoid valve 75. Furthermore, a thermometer and a pressure sensor are installed before the liquid nitrogen main solenoid valve 74.

[0031] The liquid nitrogen supply line 7 uses a vacuum-insulated line between the liquid nitrogen manual shut-off valve 71 and the liquid nitrogen main solenoid valve 74, and uses a polytetrafluoroethylene-insulated line between the liquid nitrogen main solenoid valve 74 and the liquid nitrogen chamber solenoid valve 75.

[0032] The liquid nitrogen supply pipeline 7 is equipped with a liquid nitrogen safety valve 72 and an upstream exhaust solenoid valve 73 between the liquid nitrogen manual shut-off valve 71 and the liquid nitrogen main solenoid valve 74, and a downstream exhaust solenoid valve 76 between the liquid nitrogen main solenoid valve 74 and the liquid nitrogen chamber solenoid valve 75; the outlets of the upstream exhaust solenoid valve 73 and the downstream exhaust solenoid valve 76 are both connected to the atmospheric environment.

[0033] The main solenoid valve 74 and the tank-level solenoid valve 75 of the liquid nitrogen supply pipeline 7 are closed when the battery pack is normal. The vacuum-insulated pipeline between the manual shut-off valve 71 and the main solenoid valve 74 is pre-filled with liquid nitrogen when the battery pack is normal. The nitrogen gas generated by the evaporation of liquid nitrogen in the vacuum-insulated pipeline will be discharged through the upstream exhaust solenoid valve 73 to ensure that the vacuum-insulated pipeline is full of liquid nitrogen when the battery pack is normal. When the fire protection system receives an abnormal signal from the battery pack, the main solenoid valve 74 and the tank-level solenoid valve 75 of the liquid nitrogen supply pipeline 7 will open, and the liquid nitrogen will be quickly delivered to the container where the abnormality occurred under the pressure of the storage tank.

[0034] The embodiments described above provide a detailed explanation of the technical solution and beneficial effects of this utility model. It should be understood that the above descriptions are only specific embodiments of this utility model and are not intended to limit this utility model. Any modifications, additions, and equivalent substitutions made within the scope of the principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A fire-fighting system for a battery pack container equipped with a liquid nitrogen production device, characterized in that, This includes liquid nitrogen production equipment, nitrogen supply pipelines, and liquid nitrogen supply pipelines; The liquid nitrogen production unit includes a PSA nitrogen generation system, a nitrogen storage tank, a Stirling refrigerator and a liquid nitrogen storage tank connected in sequence, and the Stirling refrigerator is connected to a chiller unit; The nitrogen storage tank and liquid nitrogen storage tank are connected to the battery pack container via nitrogen supply pipelines and liquid nitrogen supply pipelines, respectively.

2. The battery pack container fire protection system equipped with a liquid nitrogen production device according to claim 1, characterized in that, The PSA nitrogen generation system includes an air compressor, a C-stage filter, a refrigerated dryer, a four-stage filter, an air storage tank, and a PSA nitrogen generation unit connected in sequence.

3. The battery pack container fire protection system equipped with a liquid nitrogen production device according to claim 1, characterized in that, The nitrogen supply pipeline starts from the nitrogen storage tank and connects in sequence to the nitrogen manual shut-off valve, nitrogen pressure reducing valve, nitrogen main check valve, and nitrogen compartment check valve, finally reaching the battery pack container.

4. The battery pack container fire protection system equipped with a liquid nitrogen production device according to claim 3, characterized in that, The nitrogen supply pipeline is equipped with a nitrogen safety valve between the nitrogen manual shut-off valve and the nitrogen pressure reducing valve.

5. The battery pack container fire protection system equipped with a liquid nitrogen production device according to claim 1, characterized in that, The liquid nitrogen supply pipeline starts from the liquid nitrogen storage tank and connects in sequence to the liquid nitrogen manual shut-off valve, the liquid nitrogen main solenoid valve, and the liquid nitrogen tank-level solenoid valve, finally reaching the battery pack container.

6. The battery pack container fire protection system equipped with a liquid nitrogen production device according to claim 5, characterized in that, The liquid nitrogen supply pipeline uses a vacuum-insulated pipeline between the liquid nitrogen manual shut-off valve and the liquid nitrogen main solenoid valve; and uses an insulated pipeline wrapped with insulating material between the liquid nitrogen main solenoid valve and the liquid nitrogen chamber solenoid valve.

7. The battery pack container fire protection system equipped with a liquid nitrogen production device according to claim 5, characterized in that, The liquid nitrogen supply pipeline is equipped with a liquid nitrogen safety valve and an upstream exhaust solenoid valve between the liquid nitrogen manual shut-off valve and the liquid nitrogen main solenoid valve, and a downstream exhaust solenoid valve between the liquid nitrogen main solenoid valve and the liquid nitrogen chamber solenoid valve; the outlets of the upstream exhaust solenoid valve and the downstream exhaust solenoid valve are connected to the atmospheric environment or the battery pack container.

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