Molecular sieve nitrogen generation device, nitrogen protection system, power battery system and vehicle

Abstract

The utility model relates to the field of fire prevention and suppression devices suitable for road vehicle battery packs, in particular to a molecular sieve nitrogen generation device, a nitrogen protection system, a power battery system and a vehicle. The molecular sieve nitrogen making device comprises a box body, a separation tower is fixedly installed in the box body, a compressed gas inlet and a nitrogen exhaust port are formed in a tank body of the separation tower, the compressed gas inlet is connected with a compressed gas pipeline, the nitrogen exhaust port is connected with a nitrogen pipeline, and the tank body is further connected with an oxygen-enriched gas exhaust pipeline. The other end of the compressed gas pipeline, the other end of the nitrogen pipeline and the other end of the oxygen-enriched gas discharging pipeline are communicated with the outside of the box body, valves are arranged on the compressed gas pipeline, the nitrogen pipeline and the oxygen-enriched gas discharging pipeline respectively to control on-off of the compressed gas pipeline, the nitrogen pipeline and the oxygen-enriched gas discharging pipeline, and at least part of the valves are installed on the box body through corresponding supports. And pipeline arrangement spaces for arranging pipelines are respectively formed above and below the bracket. Through reasonable layout, the size of the molecular sieve nitrogen making device is reduced.

Description

Technical Field

[0001] This utility model relates to the field of fire prevention and suppression devices applicable to battery packs of highway vehicles, and in particular to a molecular sieve nitrogen generation device, a nitrogen protection system, a power battery system, and a vehicle. Background Technology

[0002] A battery pack nitrogen protection system prevents fires by filling the battery pack with nitrogen to create an oxygen-free environment. For example, patent specification CN217908665U, published on November 29, 2022, discloses a battery pack nitrogen protection system. This system utilizes the vehicle's air supply, separates the nitrogen, and then, under the control of a controller and a series of solenoid valves, delivers the nitrogen into the battery pack in a specific strategy, thus maintaining a constant nitrogen level and preventing fires.

[0003] The aforementioned patent specification discloses methods for nitrogen production using nitrogen separation membranes and molecular sieves. Nitrogen separation membranes are expensive, a major reason for the high cost of battery pack nitrogen protection systems. Molecular sieve nitrogen production offers the advantage of low cost, but it also has certain drawbacks. Specifically, to achieve a certain purity, the molecular sieve must have sufficient processing stroke. Therefore, while meeting the required nitrogen purity, the tank used for molecular sieve nitrogen production is larger than that of a membrane separator, making its application in battery pack nitrogen protection systems challenging. This challenge primarily lies in arranging the molecular sieve, piping, etc., within a relatively small enclosure. Utility Model Content

[0004] One of the objectives of this invention is to provide a molecular sieve nitrogen generator that reduces the size of the molecular sieve nitrogen generator through a reasonable layout.

[0005] Meanwhile, the purpose of this utility model is also to provide a nitrogen protection system, a power battery system, and a vehicle using the above-mentioned molecular sieve nitrogen generation device.

[0006] To solve the above problems, the molecular sieve nitrogen generator of this utility model adopts the following technical solution: The molecular sieve nitrogen generator includes a box, in which a separation tower is fixedly installed. The separation tower includes a tank and a molecular sieve disposed in the tank. The tank is provided with a compressed gas inlet and a nitrogen outlet. The compressed gas inlet is connected to a compressed gas pipeline, and the nitrogen outlet is connected to a nitrogen pipeline. The tank is also connected to an oxygen-enriched gas outlet pipeline. The other ends of the compressed gas pipeline, the nitrogen pipeline, and the oxygen-enriched gas outlet pipeline are respectively connected to the outside of the box. Valves are respectively configured for the compressed gas pipeline, the nitrogen pipeline, and the oxygen-enriched gas outlet pipeline to control their opening and closing. At least some of the valves are installed in the box through corresponding brackets to form pipeline arrangement spaces on and below the brackets, which can be used to arrange the pipelines.

[0007] Furthermore, the compressed gas inlet of the tank is located at the bottom of the tank, and the valve configured in the compressed gas pipeline is an intake solenoid valve. The intake solenoid valve is equipped with an intake solenoid valve bracket. The compressed gas pipeline includes an upstream section connected to the intake solenoid valve above the intake solenoid valve bracket and a downstream section that extends from the intake solenoid valve, bends below the intake solenoid valve bracket, and leads to the tank.

[0008] Furthermore, the tank is located near the rear side wall of the box, the air intake solenoid valve is located on the left or right side of the tank, and the downstream section is folded forward from below the support and connected to the tank.

[0009] Furthermore, the nitrogen pipeline extends in the left-right direction away from the side where the inlet solenoid valve is located, and the valve on the nitrogen pipeline is a nitrogen supply flow limiting valve, which is located below the nitrogen outlet of the tank.

[0010] Furthermore, the compressed gas pipeline is equipped with a three-way connector, and the oxygen-enriched gas discharge pipeline is connected to one of the ports of the three-way connector. The valve on the oxygen-enriched gas discharge pipeline is a pressure relief solenoid valve. By switching the inlet solenoid valve and the pressure relief solenoid valve on and off, the tank can be pressurized and depressurized.

[0011] Furthermore, the three-way connector is located at the bottom of the housing, with the interface connecting to the oxygen-enriched gas discharge pipeline facing upwards. The pressure relief solenoid valve is installed on the housing via a pressure relief solenoid valve bracket and is higher than the three-way connector. The outlet of the oxygen-enriched gas discharge pipeline is located above the pressure relief solenoid valve in the height direction.

[0012] Furthermore, the portion of the oxygen-enriched gas discharge pipe located after the pressure relief solenoid valve turns back in the left-right direction towards the side where the intake solenoid valve is located, thus leading to the outside of the housing.

[0013] Furthermore, the housing is also equipped with a gas detection module. The gas detection module is located on the side of the housing away from the inlet solenoid valve in the left-right direction, and is suspended in the air by a mounting seat on the side wall of the housing. The gas detection module is connected to a nitrogen supply pipeline for supplying nitrogen to the battery pack, an exhaust gas pipeline for discharging unqualified gases, and a gas cylinder connection pipeline for connecting to the nitrogen cylinder. The nitrogen supply pipeline and the gas cylinder connection pipeline are located below the gas detection module, and the exhaust gas pipeline is located above the gas detection module.

[0014] Beneficial effects of the molecular sieve nitrogen generator: The molecular sieve nitrogen generator of this invention is a pioneering invention. Specifically, the molecular sieve nitrogen generator of this invention is equipped with valves to control the on / off state of the compressed gas pipeline, nitrogen pipeline, and oxygen-enriched gas discharge pipeline, and at least some of the valves are mounted on the housing through corresponding supports, so that pipeline arrangement spaces can be formed on the upper and lower parts of the supports for arranging each pipeline. By adopting the above structure, different pipelines or different parts of pipelines can be arranged in layers in the height direction, thereby making full use of the limited space inside the housing. Therefore, a smaller housing can be used, thereby achieving the effect of reducing the size of the molecular sieve nitrogen generator.

[0015] The nitrogen protection system of this utility model adopts the following technical solution:

[0016] A nitrogen protection system includes a gas source and a molecular sieve nitrogen generator connected to the gas source. The molecular sieve nitrogen generator includes a housing, in which a separation tower is fixedly installed. The separation tower includes a tank and a molecular sieve disposed within the tank. The tank is provided with a compressed gas inlet and a nitrogen outlet. The compressed gas inlet is connected to a compressed gas pipeline, and the nitrogen outlet is connected to a nitrogen pipeline. The tank is also connected to an oxygen-enriched gas outlet pipeline. The other ends of the compressed gas pipeline, the nitrogen pipeline, and the oxygen-enriched gas outlet pipeline are respectively connected to the outside of the housing. Valves are respectively provided for the compressed gas pipeline, the nitrogen pipeline, and the oxygen-enriched gas outlet pipeline to control their on / off states. At least some of the valves are installed in the housing via corresponding supports, so that pipeline arrangement spaces can be formed above and below the supports for arranging each pipeline.

[0017] Furthermore, the compressed gas inlet of the tank is located at the bottom of the tank, and the valve configured in the compressed gas pipeline is an intake solenoid valve. The intake solenoid valve is equipped with an intake solenoid valve bracket. The compressed gas pipeline includes an upstream section connected to the intake solenoid valve above the intake solenoid valve bracket and a downstream section that extends from the intake solenoid valve, bends below the intake solenoid valve bracket, and leads to the tank.

[0018] Furthermore, the tank is located near the rear side wall of the box, the air intake solenoid valve is located on the left or right side of the tank, and the downstream section is folded forward from below the support and connected to the tank.

[0019] Furthermore, the nitrogen pipeline extends in the left-right direction away from the side where the inlet solenoid valve is located, and the valve on the nitrogen pipeline is a nitrogen supply flow limiting valve, which is located below the nitrogen outlet of the tank.

[0020] Furthermore, the compressed gas pipeline is equipped with a three-way connector, and the oxygen-enriched gas discharge pipeline is connected to one of the ports of the three-way connector. The valve on the oxygen-enriched gas discharge pipeline is a pressure relief solenoid valve. By switching the inlet solenoid valve and the pressure relief solenoid valve on and off, the tank can be pressurized and depressurized.

[0021] Furthermore, the three-way connector is located at the bottom of the housing, with the interface connecting to the oxygen-enriched gas discharge pipeline facing upwards. The pressure relief solenoid valve is installed on the housing via a pressure relief solenoid valve bracket and is higher than the three-way connector. The outlet of the oxygen-enriched gas discharge pipeline is located above the pressure relief solenoid valve in the height direction.

[0022] Furthermore, the portion of the oxygen-enriched gas discharge pipe located after the pressure relief solenoid valve turns back in the left-right direction towards the side where the intake solenoid valve is located, thus leading to the outside of the housing.

[0023] Furthermore, the housing is also equipped with a gas detection module. The gas detection module is located on the side of the housing away from the inlet solenoid valve in the left-right direction, and is suspended in the air by a mounting seat on the side wall of the housing. The gas detection module is connected to a nitrogen supply pipeline for supplying nitrogen to the battery pack, an exhaust gas pipeline for discharging unqualified gases, and a gas cylinder connection pipeline for connecting to the nitrogen cylinder. The nitrogen supply pipeline and the gas cylinder connection pipeline are located below the gas detection module, and the exhaust gas pipeline is located above the gas detection module.

[0024] Beneficial effects of the nitrogen protection system: The nitrogen protection system of this utility model is an improved invention. Specifically, in the nitrogen protection system of this utility model, the molecular sieve nitrogen generator is equipped with valves for the compressed gas pipeline, nitrogen pipeline, and oxygen-enriched gas discharge pipeline to control their on / off states. At least some of the valves are mounted on the housing via corresponding supports, forming pipeline arrangement spaces on and below the supports for arranging each pipeline. By adopting the above structure, different pipelines or different parts of pipelines can be arranged in layers in the height direction, thereby making full use of the limited space inside the housing. Therefore, a smaller housing can be used, thus achieving the effect of reducing the size of the molecular sieve nitrogen generator.

[0025] The power battery system of this utility model adopts the following technical solution:

[0026] A power battery system includes a battery pack, which is equipped with a nitrogen protection system. The nitrogen protection system includes a gas source and a molecular sieve nitrogen generator connected to the gas source. The molecular sieve nitrogen generator includes a housing, in which a separation tower is fixedly installed. The separation tower includes a tank and a molecular sieve disposed within the tank. The tank is provided with a compressed gas inlet and a nitrogen outlet. The compressed gas inlet is connected to a compressed gas pipeline, and the nitrogen outlet is connected to a nitrogen pipeline. The tank is also connected to an oxygen-enriched gas outlet pipeline. The other ends of the compressed gas pipeline, the nitrogen pipeline, and the oxygen-enriched gas outlet pipeline are respectively connected to the outside of the housing. Valves are respectively provided for the compressed gas pipeline, the nitrogen pipeline, and the oxygen-enriched gas outlet pipeline to control their on / off states. At least some of the valves are installed in the housing via corresponding brackets to form pipeline arrangement spaces on and below the brackets for arranging the various pipelines.

[0027] Furthermore, the compressed gas inlet of the tank is located at the bottom of the tank, and the valve configured in the compressed gas pipeline is an intake solenoid valve. The intake solenoid valve is equipped with an intake solenoid valve bracket. The compressed gas pipeline includes an upstream section connected to the intake solenoid valve above the intake solenoid valve bracket and a downstream section that extends from the intake solenoid valve, bends below the intake solenoid valve bracket, and leads to the tank.

[0028] Furthermore, the tank is located near the rear side wall of the box, the air intake solenoid valve is located on the left or right side of the tank, and the downstream section is folded forward from below the support and connected to the tank.

[0029] Furthermore, the nitrogen pipeline extends in the left-right direction away from the side where the inlet solenoid valve is located, and the valve on the nitrogen pipeline is a nitrogen supply flow limiting valve, which is located below the nitrogen outlet of the tank.

[0030] Furthermore, the compressed gas pipeline is equipped with a three-way connector, and the oxygen-enriched gas discharge pipeline is connected to one of the ports of the three-way connector. The valve on the oxygen-enriched gas discharge pipeline is a pressure relief solenoid valve. By switching the inlet solenoid valve and the pressure relief solenoid valve on and off, the tank can be pressurized and depressurized.

[0031] Furthermore, the three-way connector is located at the bottom of the housing, with the interface connecting to the oxygen-enriched gas discharge pipeline facing upwards. The pressure relief solenoid valve is installed on the housing via a pressure relief solenoid valve bracket and is higher than the three-way connector. The outlet of the oxygen-enriched gas discharge pipeline is located above the pressure relief solenoid valve in the height direction.

[0032] Furthermore, the portion of the oxygen-enriched gas discharge pipe located after the pressure relief solenoid valve turns back in the left-right direction towards the side where the intake solenoid valve is located, thus leading to the outside of the housing.

[0033] Furthermore, the housing is also equipped with a gas detection module. The gas detection module is located on the side of the housing away from the inlet solenoid valve in the left-right direction, and is suspended in the air by a mounting seat on the side wall of the housing. The gas detection module is connected to a nitrogen supply pipeline for supplying nitrogen to the battery pack, an exhaust gas pipeline for discharging unqualified gases, and a gas cylinder connection pipeline for connecting to the nitrogen cylinder. The nitrogen supply pipeline and the gas cylinder connection pipeline are located below the gas detection module, and the exhaust gas pipeline is located above the gas detection module.

[0034] Beneficial effects of the power battery system: The power battery system of this utility model is an improved invention. Specifically, in the power battery system of this utility model, the molecular sieve nitrogen generator is equipped with valves for the compressed gas pipeline, nitrogen pipeline, and oxygen-enriched gas discharge pipeline to control their on / off states. At least some of the valves are mounted on the housing via corresponding supports, forming pipeline arrangement spaces on and below the supports for arranging the various pipelines. By adopting the above structure, different pipelines or different parts of pipelines can be arranged in layers in the height direction, thereby making full use of the limited space inside the housing. Therefore, a smaller housing can be used, thus achieving the effect of reducing the size of the molecular sieve nitrogen generator.

[0035] The vehicle of this utility model adopts the following technical solution:

[0036] A vehicle includes a power battery system, the power battery system including a battery pack, the battery pack being equipped with a nitrogen protection system, the nitrogen protection system including a gas source and a molecular sieve nitrogen generator connected to the gas source, the molecular sieve nitrogen generator including a housing, a separation tower fixedly installed in the housing, the separation tower including a tank and a molecular sieve disposed in the tank, the tank being provided with a compressed gas inlet and a nitrogen outlet, the compressed gas inlet being connected to a compressed gas pipeline, the nitrogen outlet being connected to a nitrogen pipeline, the tank being also connected to an oxygen-enriched gas outlet pipeline, the other ends of the compressed gas pipeline, the nitrogen pipeline and the oxygen-enriched gas outlet pipeline respectively leading to the outside of the housing, the compressed gas pipeline, the nitrogen pipeline and the oxygen-enriched gas outlet pipeline being respectively equipped with valves to control their on / off states, at least some of the valves being installed in the housing via corresponding brackets to form pipeline arrangement spaces above and below the brackets for arranging each pipeline.

[0037] Furthermore, the compressed gas inlet of the tank is located at the bottom of the tank, and the valve configured in the compressed gas pipeline is an intake solenoid valve. The intake solenoid valve is equipped with an intake solenoid valve bracket. The compressed gas pipeline includes an upstream section connected to the intake solenoid valve above the intake solenoid valve bracket and a downstream section that extends from the intake solenoid valve, bends below the intake solenoid valve bracket, and leads to the tank.

[0038] Furthermore, the tank is located near the rear side wall of the box, the air intake solenoid valve is located on the left or right side of the tank, and the downstream section is folded forward from below the support and connected to the tank.

[0039] Furthermore, the nitrogen pipeline extends in the left-right direction away from the side where the inlet solenoid valve is located, and the valve on the nitrogen pipeline is a nitrogen supply flow limiting valve, which is located below the nitrogen outlet of the tank.

[0040] Furthermore, the compressed gas pipeline is equipped with a three-way connector, and the oxygen-enriched gas discharge pipeline is connected to one of the ports of the three-way connector. The valve on the oxygen-enriched gas discharge pipeline is a pressure relief solenoid valve. By switching the inlet solenoid valve and the pressure relief solenoid valve on and off, the tank can be pressurized and depressurized.

[0041] Furthermore, the three-way connector is located at the bottom of the housing, with the interface connecting to the oxygen-enriched gas discharge pipeline facing upwards. The pressure relief solenoid valve is installed on the housing via a pressure relief solenoid valve bracket and is higher than the three-way connector. The outlet of the oxygen-enriched gas discharge pipeline is located above the pressure relief solenoid valve in the height direction.

[0042] Furthermore, the portion of the oxygen-enriched gas discharge pipe located after the pressure relief solenoid valve turns back in the left-right direction towards the side where the intake solenoid valve is located, thus leading to the outside of the housing.

[0043] Furthermore, the housing is also equipped with a gas detection module. The gas detection module is located on the side of the housing away from the inlet solenoid valve in the left-right direction, and is suspended in the air by a mounting seat on the side wall of the housing. The gas detection module is connected to a nitrogen supply pipeline for supplying nitrogen to the battery pack, an exhaust gas pipeline for discharging unqualified gases, and a gas cylinder connection pipeline for connecting to the nitrogen cylinder. The nitrogen supply pipeline and the gas cylinder connection pipeline are located below the gas detection module, and the exhaust gas pipeline is located above the gas detection module.

[0044] Beneficial effects of the vehicle: The vehicle of this utility model is an improved invention. Specifically, in the vehicle of this utility model, the molecular sieve nitrogen generator of the power battery system is equipped with valves to control the opening and closing of the compressed gas pipeline, nitrogen pipeline and oxygen-enriched gas discharge pipeline, and at least some valves are installed on the housing through corresponding brackets, so that pipeline arrangement spaces can be formed on the upper and lower parts of the brackets for arranging each pipeline. By adopting the above structure, different pipelines or different parts of pipelines can be arranged in layers in the height direction, thereby making full use of the limited space in the housing. Therefore, a smaller housing can be used, thereby achieving the effect of reducing the size of the molecular sieve nitrogen generator. Attached Figure Description

[0045] Figure 1 This is a perspective view of one embodiment of a molecular sieve nitrogen generator;

[0046] Figure 2 yes Figure 1 A 3D view of the molecular sieve nitrogen generator after the tank cover has been removed;

[0047] Figure 3 yes Figure 1 A top view of the molecular sieve nitrogen generator after the tank cover has been removed;

[0048] Figure 4 yes Figure 1 The first perspective view of the molecular sieve nitrogen generator after removing the casing (viewed from the front).

[0049] Figure 5 yes Figure 1 The second perspective view of the molecular sieve nitrogen generator after removing the housing (viewed from the front).

[0050] Figure 6 yes Figure 1 The third perspective view of the molecular sieve nitrogen generator after removing the casing (viewed from the front).

[0051] Figure 7 yes Figure 1 The first perspective view of the molecular sieve nitrogen generator after removing the casing (viewed from the bottom).

[0052] In the diagram: 1. Box body; 101. Box body; 102. Box cover; 2. Tank body; 3. Compressed gas pipeline; 301. Upstream section; 302. Downstream section; 4. Nitrogen pipeline; 5. Oxygen-enriched gas discharge pipeline; 6. Inlet solenoid valve; 7. Inlet solenoid valve bracket; 701. "U"-shaped support leg; 8. Nitrogen supply flow limiting valve; 9. T-connector; 10. Pressure relief solenoid valve; 11. Pressure relief solenoid valve bracket; 12. Gas detection module; 13. Mounting base; 14. Nitrogen supply pipeline; 15. Exhaust gas pipeline; 16. Gas cylinder connection pipeline. Detailed Implementation

[0053] The features and performance of this utility model will be further described in detail below with reference to specific embodiments.

[0054] When applied to battery pack nitrogen protection systems, molecular sieve nitrogen generators require a small size. The larger size of molecular sieve nitrogen generators compared to membrane separators is due not only to the larger separation tower itself but also to their more complex piping. Therefore, a rational design of the separation tower and piping layout within the housing can reduce the size of the molecular sieve nitrogen generator to meet the requirements of battery pack nitrogen protection systems. Based on this inventive concept, this invention proposes technical solutions for a molecular sieve nitrogen generator, a nitrogen protection system, a power battery system, and a vehicle.

[0055] Based on the above inventive concept, the specific implementation method of the molecular sieve nitrogen generator of this utility model is as follows:

[0056] The molecular sieve nitrogen generator of this invention includes a housing 1, which serves as the outer protective shell of the entire device and can be installed on a vehicle during use. Specifically, it includes a housing body 101 and a housing cover 102, and is generally rectangular in shape. A separation tower is installed in the housing 1. The separation tower is the core component of nitrogen generation. As a typical structure, it includes a tank 2 and a molecular sieve (not shown in the figure) disposed in the tank. During operation, by alternately introducing compressed air into the tank 2 and depressurizing the tank 2, nitrogen in the air can be separated, and oxygen-rich gas other than nitrogen can be discharged. This is the basic working principle of the molecular sieve nitrogen generator. Based on the working principle of the molecular sieve nitrogen generator, the tank 2 is equipped with a compressed gas inlet and a nitrogen outlet. The compressed gas inlet is connected to a compressed gas pipeline 3, and the nitrogen outlet is connected to a nitrogen pipeline 4. The tank is also connected to an oxygen-enriched gas outlet pipeline 5. The other ends of the compressed gas pipeline 3, the nitrogen pipeline 4, and the oxygen-enriched gas outlet pipeline 5 are respectively connected to the outside of the housing 1. When the molecular sieve nitrogen generator is applied to a battery pack nitrogen protection device, the compressed gas pipeline 3 is connected to a compressor outside the housing 1 to supply compressed air to the separation tower. The nitrogen pipeline 4 is generally connected to a nitrogen storage tank to temporarily store the generated nitrogen. The oxygen-enriched gas outlet pipeline 5 is generally directly connected to the external environment to discharge the oxygen-enriched gas generated during the nitrogen generation process into the surrounding environment.

[0057] To control the on / off state of the compressed gas pipeline 3, nitrogen pipeline 4, and oxygen-enriched gas discharge pipeline 5, each of these pipelines is equipped with a solenoid valve. At least some of these valves can be mounted on the housing 1 via corresponding brackets, creating pipeline arrangement spaces above and below the brackets for arranging each pipeline. This allows the pipelines, or different sections of each pipeline, to be arranged in layers, fully utilizing the space within the housing and reducing the requirements for the housing size.

[0058] Figure 1-7This illustration shows a typical embodiment of the molecular sieve nitrogen generator of this invention. In this embodiment, the compressed gas inlet of the tank 2 is located at the lower part of the tank 2. The solenoid valve configured in the compressed gas pipeline 3 is defined as the inlet solenoid valve 6. The inlet solenoid valve 6 is equipped with the aforementioned support, which is the inlet solenoid valve support 7. The compressed gas pipeline 3 includes an upstream section 301 connected to the inlet solenoid valve above the inlet solenoid valve support 7 and a downstream section 302 that extends from the inlet solenoid valve 6, bends downwards from the inlet solenoid valve support 7, and leads to the tank 2. The tank 2 is located near the rear side wall of the housing 1, the inlet solenoid valve 6 is located on the left side of the tank 2, and the downstream section 302 bends forward from below the support and connects to the tank 2. The inlet solenoid valve support 7 includes two side-by-side U-shaped legs 701. The space between the two U-shaped legs 701 can be used to arrange corresponding pipelines, such as the compressed gas pipeline 3, which can bend back from this space.

[0059] Of course, in other embodiments, the intake solenoid valve 6 can also be located on the right side of the tank 2. Arranging the two side by side is to make full use of the space in the left and right directions of the tank. The intake solenoid valve bracket 7 can also adopt an integrated structure, such as setting it as a portal bracket or other structures.

[0060] The nitrogen pipeline 4 extends in the left-right direction away from the side where the inlet solenoid valve 6 is located. The valve on the nitrogen pipeline 4 is a nitrogen supply flow limiting valve 8, which is positioned below the nitrogen outlet of the tank 2. This forms a layout structure in which the compressed gas pipeline 3, the separation tower, and the nitrogen pipeline 4 are arranged in a left-center-right sequence, thus making full use of the space in the left-right direction inside the tank 1.

[0061] In a preferred embodiment, the compressed gas pipeline 3 is equipped with a three-way connector 9, and the oxygen-enriched gas discharge pipeline 5 is connected to one of the ports of the three-way connector 9. The solenoid valve on the oxygen-enriched gas discharge pipeline 5 is a pressure relief solenoid valve 10. By switching the inlet solenoid valve 6 and the pressure relief solenoid valve 10 on and off, the tank 2 can be pressurized and depressurized. Specifically, the three-way connector 9 is located at the bottom of the housing 1, with the interface connecting to the oxygen-enriched gas discharge pipeline 5 facing upwards. The pressure relief solenoid valve 10 is mounted on the housing via a pressure relief solenoid valve bracket 11 and is higher than the three-way connector. The pressure relief solenoid valve bracket 11 has the same structure as the inlet solenoid valve bracket 7. The outlet of the oxygen-enriched gas discharge pipeline 5 is located above the pressure relief solenoid valve 10 in the height direction. The portion of the pipeline after the pressure relief solenoid valve 10 folds back towards the side where the inlet solenoid valve 7 is located in the left and right directions and leads out of the housing.

[0062] In the above embodiments, the dedicated oxygen-enriched gas outlet on the tank is omitted by setting the T-connector 9. In some other embodiments, an oxygen-enriched gas outlet can be set on the tank and connected to the oxygen-enriched gas discharge pipeline. In this case, the T-connector can be omitted.

[0063] The housing 1 is also equipped with a gas detection module 12. The gas detection module 12 is located on the side of the housing away from the inlet solenoid valve 6 in the left-right direction, and is suspended in the air by the mounting base 13 provided on the side wall of the housing 1. The suspended gas detection module 12 has space above and below for laying pipelines and other components. The gas detection module 12 is connected to a nitrogen supply pipeline 14 for supplying nitrogen to the battery pack, an exhaust gas pipeline 15 for discharging unqualified gases, and a gas cylinder connection pipeline 16 for connecting nitrogen cylinders. The nitrogen supply pipeline and the gas cylinder connection pipeline 16 are located below the gas detection module 12, and the exhaust gas pipeline 15 is located above the gas detection module 12.

[0064] When the molecular sieve nitrogen generator is working, the generated nitrogen gas is first transported to a nitrogen storage tank via nitrogen pipeline 4. The nitrogen gas in the storage tank then travels to the gas detection module 12 via gas cylinder connection pipeline 16. The gas detection module 12 detects the quality of the nitrogen gas. Qualified nitrogen gas can be transported to the battery pack via the nitrogen supply pipeline, while unqualified nitrogen gas will be discharged into the environment via the waste gas pipeline 15. The pipeline connection relationship described here is prior art, and for details, please refer to the patent specification with authorization announcement number CN217908665U. It will not be elaborated here.

[0065] Specific implementation of the nitrogen protection system of this utility model:

[0066] The nitrogen protection system of this utility model includes a gas source (not shown in the figure) and a molecular sieve device connected to the gas source. The gas source can be a vehicle gas source or a separately configured independent gas source. The molecular sieve device is set in a box and is used for nitrogen separation. It is the molecular sieve device of this utility model, which will not be described in detail here.

[0067] Specific implementation of the power battery system of this utility model:

[0068] The power battery system of this utility model includes a battery pack (electric box) and a battery pack nitrogen protection system. The battery pack nitrogen protection system is the nitrogen protection system of this utility model. The structure of the battery pack and its cooperation structure with the battery pack nitrogen protection system are existing technologies and will not be described in detail here.

[0069] Specific embodiments of the vehicle of this utility model:

[0070] The vehicle of this utility model includes a power battery system, wherein the power battery system is the power battery system of this utility model, which will not be described in detail here.

[0071] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. The patent protection scope of the present utility model shall be determined by the claims. Similarly, any equivalent structural changes made based on the description and drawings of the present utility model shall also be included within the protection scope of the present utility model.

Claims

1. A molecular sieve nitrogen generator, characterized in that, The system includes a housing, in which a separation tower is fixedly installed. The separation tower includes a tank and a molecular sieve disposed within the tank. The tank is provided with a compressed gas inlet and a nitrogen outlet. The compressed gas inlet is connected to a compressed gas pipeline, and the nitrogen outlet is connected to a nitrogen pipeline. The tank is also connected to an oxygen-enriched gas outlet pipeline. The other ends of the compressed gas pipeline, the nitrogen pipeline, and the oxygen-enriched gas outlet pipeline are respectively connected to the outside of the housing. Valves are respectively provided for the compressed gas pipeline, the nitrogen pipeline, and the oxygen-enriched gas outlet pipeline to control their on / off states. At least some of the valves are installed in the housing via corresponding supports, so that pipeline arrangement spaces can be formed above and below the supports for arranging each pipeline.

2. The molecular sieve nitrogen generator according to claim 1, characterized in that, The compressed gas inlet of the tank is located at the bottom of the tank. The valve configured in the compressed gas pipeline is an intake solenoid valve. The intake solenoid valve is equipped with an intake solenoid valve bracket. The compressed gas pipeline includes an upstream section connected to the intake solenoid valve above the intake solenoid valve bracket and a downstream section that extends from the intake solenoid valve, bends below the intake solenoid valve bracket, and leads to the tank.

3. The molecular sieve nitrogen generator according to claim 2, characterized in that, The tank is located near the rear side wall of the box, the air intake solenoid valve is located on the left or right side of the tank, and the downstream section is folded forward from below the support and connected to the tank.

4. The molecular sieve nitrogen generator according to claim 3, characterized in that, The nitrogen pipeline extends in the left-right direction away from the side where the inlet solenoid valve is located. The valve on the nitrogen pipeline is a nitrogen supply flow limiting valve, and the position of the nitrogen supply flow limiting valve is lower than the nitrogen outlet of the tank.

5. The molecular sieve nitrogen generator according to claim 2, characterized in that, The compressed gas pipeline is equipped with a three-way connector, and the oxygen-enriched gas discharge pipeline is connected to one of the ports of the three-way connector. The valve on the oxygen-enriched gas discharge pipeline is a pressure relief solenoid valve. The tank can be pressurized and depressurized by switching the inlet solenoid valve and the pressure relief solenoid valve on and off.

6. The molecular sieve nitrogen generator according to claim 5, characterized in that, The three-way connector is located at the bottom of the housing, with the interface connecting to the oxygen-enriched gas discharge pipeline facing upwards. The pressure relief solenoid valve is installed on the housing via a pressure relief solenoid valve bracket and is higher than the three-way connector. The outlet of the oxygen-enriched gas discharge pipeline is located above the pressure relief solenoid valve in the height direction.

7. The molecular sieve nitrogen generator according to claim 6, characterized in that, The portion of the oxygen-enriched gas discharge pipeline located after the pressure relief solenoid valve turns back in the left-right direction towards the side where the intake solenoid valve is located, leading out of the housing.

8. The molecular sieve nitrogen generator according to claim 2, characterized in that, The housing is also equipped with a gas detection module, which is located on the side of the tank away from the inlet solenoid valve in the left-right direction and is suspended in the air by a mounting seat on the side wall of the housing. The gas detection module is connected to a nitrogen supply pipeline for supplying nitrogen to the battery pack, an exhaust gas pipeline for discharging unqualified gases, and a gas cylinder connection pipeline for connecting to the nitrogen cylinder. The nitrogen supply pipeline and the gas cylinder connection pipeline are located below the gas detection module, and the exhaust gas pipeline is located above the gas detection module.

9. A nitrogen protection system, comprising a gas source and a molecular sieve nitrogen generator connected to the gas source, characterized in that, The molecular sieve nitrogen generator is the molecular sieve nitrogen generator according to any one of claims 1-8.

10. A power battery system, comprising a battery pack, wherein the battery pack is equipped with a nitrogen protection system, characterized in that, The nitrogen protection system is the nitrogen protection system as described in claim 9.

11. A vehicle, including a power battery system, characterized in that, The power battery system is the power battery system as described in claim 10.

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