Buoyancy change-over valve

Abstract

The utility model provides a buoyancy change-over valve which is characterized in that an input channel, a valve core cavity and an output channel which are sequentially connected are arranged in a valve body, the valve core cavity is obliquely arranged, and a sliding rail component which is provided with an input connecting port, an output connecting port, a first sealing part and an abutting ring and a sliding rail body is arranged in the valve core cavity. An atomization channel which has preset opening pressure and is communicated with the valve element cavity is arranged, and the valve element slides in the valve element sliding channel and is configured to have a detection operation configuration and a fire-fighting operation configuration; under the detection operation configuration, the valve core freely falls under the action of gravity, and the valve core cavity is respectively communicated with the input channel and the output channel; and under the fire-fighting operation configuration, the valve element overcomes gravity to rise and closes the through hole of the first sealing part under the action of a fire-fighting medium input by the output channel, and the fire-fighting medium overcomes the preset opening pressure and is atomized and output by the atomization channel. Therefore, the switching between the gas passage and the fire-fighting medium passage without an additional power device can be realized.

Description

Technical Field

[0001] The utility model belongs to the technical field of electric energy storage safety protection systems, and particularly relates to a buoyancy conversion valve. Background Technique

[0002] With the increasing depletion of traditional energy sources, it has greatly promoted the development of new energy sources, and the installed capacity has also increased rapidly. New energy power generation such as wind energy and solar energy depends on natural conditions, has the characteristics of volatility and intermittency, and is difficult to regulate and control. Large-scale grid connection operation will have a significant impact on the safe and stable operation of the power grid. Energy storage technology can greatly solve the problems of randomness and volatility of new energy power generation and improve the utilization rate of renewable clean energy. The large-scale installation of new energy has given rise to the rapid development of large-scale energy storage systems.

[0003] Currently, the large-scale battery energy storage technology is the fastest developing in large-scale energy storage technologies. Its characteristics are that the power and energy can be flexibly configured according to different application needs, and it has a fast response speed, suitable for large-scale applications and mass production. In recent years, with the actual demand and policy requirements, large-scale battery energy storage power stations have started to be built and operated in large quantities. Battery energy storage has many advantages, but the battery is a device containing high-energy substances, with certain potential safety hazards and the probability of dangerous accidents. As the scale of the battery energy storage system expands, the probability of dangerous accidents will increase greatly. Usually, under the dual action of external electrical and thermal stimuli and its own aging, the battery may undergo a thermal runaway reaction, releasing a large amount of high-temperature combustible gas mixture. When encountering oxygen and electric sparks in the external air, it is extremely easy to explode.

[0004] The existing energy storage power station is composed of individual battery cabinets arranged as basic units in a container. Since the container is usually of standard size, in order to increase the battery capacity in the container as much as possible and save costs, it is necessary to reduce the volume and cost of each battery cabinet as much as possible. Usually, a battery cabinet will include a cabinet body and several battery packs stacked in the cabinet body, and each battery pack has the possibility of thermal runaway and other situations.

[0005] The existing safety protection scheme usually sets multi-in-one composite detectors on each battery pack in the cabinet body, and then can detect the temperature and escaped gas in the battery pack respectively. If an abnormality is detected, the fire extinguishing procedure is executed to inject the fire extinguishing agent into the corresponding battery pack through the pipeline for suppression and extinguishment. However, this scheme will lead to the problem of too high cost because each battery pack needs to be equipped with a detector.

[0006] Another existing safety protection solution is to lead out the gas in each battery pack for detection and then return it to the battery pack to form a gas cycle. However, in this method, in order to minimize the overall volume of the battery cabinet as much as possible, a three-way valve is usually set up. Through this three-way valve, the air path for leading out the gas is integrated into the original fire extinguishing pipeline, that is, the three-way valve realizes the conversion between the fire extinguishing path and the gas circulation path. However, in this safety protection solution, the three-way valve usually adopts a ball valve, which has the problems of large volume and high cost. Although the number of detectors can be reduced, the overall volume and cost of the battery cabinet do not change much. Summary of the Invention

[0007] The technical problem to be solved by the present utility model is to provide a buoyancy conversion valve to solve the problems of large volume and high cost of the battery cabinet caused by the existing safety protection solutions for electric energy storage.

[0008] To solve the above problems, the technical solution of the present utility model is as follows:

[0009] A buoyancy conversion valve of the present utility model is used for an electrochemical energy storage safety protection system, and includes:

[0010] A valve body, on which there is an installation surface for installing to the battery pack. An inclined valve core cavity is provided inside the valve body. An input channel and an output channel communicating with both ends of the valve core cavity are provided on the valve body. The height of the input channel is higher than that of the output channel, and the input channel penetrates through to the installation surface;

[0011] One end of the valve core cavity communicating with the input channel is an input connection port, and one end of the valve core cavity communicating with the output channel is an output connection port; a first sealing part is provided at the input connection port; at the output connection port, there is a slide rail member extending towards the input connection port. The slide rail member includes an abutting ring and a plurality of slide rail bodies arranged at intervals along the circumferential direction. The plurality of slide rail bodies cooperate to form a valve core sliding channel. The first ends of the slide rail bodies are respectively connected to the output connection port, and the second ends of the slide rail bodies are respectively connected to the abutting ring. The abutting ring is configured to abut against the first sealing part and seal the gap between the abutting ring and the inner wall of the valve core cavity;

[0012] A valve core, slidably connected inside the valve core sliding channel; wherein, a through hole communicating the input channel and the valve core cavity is provided on the first sealing part, and the through hole is configured to be closed by the valve core to cut off the input channel and the valve core cavity;

[0013] An atomization channel is provided in the valve body. The input end of the atomization channel communicates with the valve core cavity, and the atomization channel is configured to have a preset opening pressure;

[0014] The spool is configured to switch between a detection operation configuration and a fire-fighting operation configuration; in the detection operation configuration, the spool freely falls under the action of gravity and the spool cavity is respectively communicated with the input channel and the output channel; in the fire-fighting operation configuration, the spool rises against gravity under the action of the fire-fighting medium input from the output channel and closes the through hole, and the pressure of the fire-fighting medium in the spool cavity overcomes the preset opening pressure and is atomized and output by the atomization channel.

[0015] For the buoyancy conversion valve of the present utility model, the first sealing portion includes a first sealing ring and a first sealing gasket stacked and arranged;

[0016] The first sealing ring is arranged on one side of the first sealing gasket facing the input connection port, and the through hole is provided on the first sealing gasket.

[0017] For the buoyancy conversion valve of the present utility model, a gas communication channel communicating the input connection port and the output connection port is provided in the spool cavity; and an opening maintaining structure is provided in the output connection port and / or the spool sliding channel, and the opening maintaining structure is configured to limit the spool at an interval from the output connection port.

[0018] For the buoyancy conversion valve of the present utility model, the valve body includes a main body housing and a rear cover bracket;

[0019] The main body housing includes a connected horizontal main body section and an inclined main body section. The input channel and the atomization channel are provided in the horizontal main body section, and the spool cavity is provided in the inclined main body section;

[0020] The rear cover bracket is connected to the main body housing, and the output channel is provided in the rear cover bracket.

[0021] For the buoyancy conversion valve of the present utility model, the plane where the axis of the input channel and the axis of the spool cavity are located is the first plane, and the output channel is perpendicular to the first plane.

[0022] For the buoyancy conversion valve of the present utility model, the opening maintaining structure is a convex structure provided on one side of the slide rail body close to the output connection port, and the convex direction of the convex structure faces the axis of the spool sliding channel.

[0023] For the buoyancy conversion valve of the present utility model, the output channel includes a connected guiding channel section and a connecting channel section. The guiding channel section is connected to the spool cavity, and the cross-sectional area of the guiding channel section is smaller than the cross-sectional area of the spool.

[0024] For the buoyancy conversion valve of the present utility model, the included angle formed by the axis of the input channel and the axis of the spool sliding channel is 45°.

[0025] For the buoyancy conversion valve of the present utility model, the atomization channel includes a first installation through hole opened in the valve body and an atomization nozzle. The first end of the first installation through hole communicates with the valve core cavity, the second end of the first installation through hole penetrates the installation surface, and the atomization nozzle is installed in the first installation through hole.

[0026] For the buoyancy conversion valve of the present utility model, the valve core is a spherical valve core, and the gravity of the spherical valve core is less than the buoyancy generated by it in the fire-fighting medium.

[0027] Due to the adoption of the above technical solutions, the present utility model has the following advantages and positive effects compared with the prior art:

[0028] In an embodiment of the present utility model, an input channel, a valve core cavity and an output channel are sequentially arranged in the valve body, the valve core cavity is inclined and the input channel is higher than the output channel. The valve core cavity is provided with an input connection port, an output connection port, a first sealing part and a slide rail member including a butting ring and a slide rail body, and an atomization channel with a preset opening pressure and communicating with the valve core cavity is further provided. The valve core slides in the valve core sliding channel and is configured to have a detection operation configuration and a fire-fighting operation configuration. In the detection operation configuration, the valve core freely falls under the action of gravity and the valve core cavity communicates with the input channel and the output channel respectively. In the fire-fighting operation configuration, the valve core rises against gravity under the action of the fire-fighting medium input from the output channel and closes the through hole of the first sealing part, and the fire-fighting medium overcomes the preset opening pressure and is atomized and output from the atomization channel. Furthermore, the conversion between the gas path and the fire-fighting medium path without an additional power device can be realized. Compared with the existing ball valve scheme, the volume is greatly reduced and the cost is also reduced, thus solving the problems of large volume and high cost of the battery cabinet caused by the existing electric energy storage safety protection scheme. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 is an exploded view of the buoyancy conversion valve according to Embodiment 1 of the present utility model;

[0030] Figure 2 is a schematic diagram of the buoyancy conversion valve according to Embodiment 1 of the present utility model in the detection operation configuration;

[0031] Figure 3 is a schematic diagram of the buoyancy conversion valve according to Embodiment 1 of the present utility model in the fire-fighting operation configuration;

[0032] Description of the reference numerals: 1, main body housing; 101, input channel; 102, valve core cavity; 2, first sealing ring; 3, first sealing gasket; 4, spherical valve core; 5, connection sealing part; 6, rear cover bracket; 601, output channel; 7, bolt; 8, quick connector; 9, atomization nozzle; 10, slide rail body; 11, butting ring. Detailed implementation mode

[0033] The following further describes in detail a buoyancy conversion valve proposed by the present utility model in conjunction with the accompanying drawings and specific embodiments. According to the following description and the claims, the advantages and features of the present utility model will be clearer.

[0034] Embodiment 1

[0035] Refer to Figures 1 to 3 , in one embodiment, a buoyancy conversion valve for an electrochemical energy storage safety protection system includes a valve body and a valve core.

[0036] The valve body is provided with a mounting surface for mounting to the battery pack. An inclined valve core cavity 102 is provided inside the valve body. An input channel 101 and an output channel 601 communicating with both ends of the valve core cavity 102 are provided on the valve body. The height of the input channel 101 is higher than that of the output channel 601, and the input channel 101 penetrates through to the mounting surface.

[0037] Among them, one end of the valve core cavity 102 communicating with the input channel 101 is an input connection port, and one end of the valve core cavity 102 communicating with the output channel 601 is an output connection port. A first sealing portion is provided at the input connection port, and a slide rail member extending towards the input connection port is provided at the output connection port. The slide rail member includes an abutting ring 11 and a plurality of slide rail bodies 10 arranged at intervals in the circumferential direction. The plurality of slide rail bodies 10 cooperate to form a valve core sliding channel (the valve core sliding channel is the area covered by the sliding trajectory of the valve core, which is also inclined). The first ends of the slide rail bodies 10 are respectively connected to the output connection port, and the second ends of the slide rail bodies 10 are connected to the abutting ring 11. The abutting ring 11 is configured to abut against the first sealing portion and seal the gap between the abutting ring 11 and the inner wall of the valve core cavity 102. The number of the slide rail bodies 10 can be specifically three or more. The surface of the slide rail body 10 facing the axis is used to limit the sliding trajectory of the valve core.

[0038] The valve core is slidably connected in the above-mentioned valve core sliding channel. Among them, a through hole communicating the input channel 101 and the valve core cavity is provided on the first sealing portion. The through hole is configured to be closed by the valve core to cut off the communication between the input channel 101 and the valve core cavity. That is, the first sealing portion can be set as an annular sealing structure, and the through hole in the inner ring is the through hole.

[0039] In addition, an atomization channel is also provided inside the valve body. The input end of the atomization channel communicates with the valve core cavity 102, and the output end is used to communicate with the battery pack. The atomization channel is configured to have a preset opening pressure (the output channel 601, the valve core cavity 102, and the atomization channel form a fire protection medium channel). The preset opening pressure is not less than 0.3MP.

[0040] The valve core is configured to switch between a detection operation configuration and a fire-fighting operation configuration. In the detection operation configuration, the valve core freely falls under the action of gravity, and the valve core cavity 102 is respectively communicated with the input channel 101 and the output channel 601. In the fire-fighting operation configuration, the valve core rises against gravity under the action of the fire-fighting medium input from the output channel 601 and closes the through hole, and the pressure of the fire-fighting medium in the valve core cavity 102 overcomes the preset opening pressure and is atomized and output by the atomization channel.

[0041] In this embodiment, an input channel 101, a valve core cavity 102, and an output channel 601 are sequentially arranged in the valve body. The valve core cavity 102 is inclined, and the input channel 101 is higher than the output channel 601. The valve core cavity 102 is provided with an input connection port, an output connection port, a first sealing portion, and a slide rail member including an abutting ring 11 and a slide rail body 10. Further, an atomization channel with a preset opening pressure and communicated with the valve core cavity 102 is provided. The valve core slides in the valve core sliding channel and is configured to have a detection operation configuration and a fire-fighting operation configuration. In the detection operation configuration, the valve core freely falls under the action of gravity, and the valve core cavity 102 is respectively communicated with the input channel 101 and the output channel 102 (the gas passage is communicated). In the fire-fighting operation configuration, the valve core rises against gravity under the action of the fire-fighting medium input from the output channel 601 and closes the through hole of the first sealing portion, and the fire-fighting medium overcomes the preset opening pressure and is atomized and output by the atomization channel (the fire-fighting medium passage is communicated). Furthermore, the conversion between the gas passage and the fire-fighting medium passage without an additional power device can be realized. Compared with the existing ball valve scheme, the volume is greatly reduced, and the cost is also reduced. Thus, the problems of large volume and high cost of the battery cabinet caused by the existing electric energy storage safety protection scheme are solved.

[0042] The specific structure of the buoyancy conversion valve in this embodiment will be further described below:

[0043] In this embodiment, a gas communication channel communicating the input connection port and the output connection port may be further provided in the valve core cavity 102 (the gas communication channel and the valve core sliding channel may be independent of each other, or partially included or fully included. The input channel 101, the gas communication channel, and the output channel 601 cooperate to form an air flow channel). Among them, an opening maintaining structure is provided in the output connection port and / or the valve core sliding channel. Specifically, the aforementioned gas communication channel may include the intervals between the respective slide rail bodies 10, and the intervals between the valve core sliding channel formed by the slide rail bodies 10 and the inner side wall of the valve core cavity.

[0044] Moreover, an opening maintaining structure may be provided in the output connection port and / or the valve core sliding channel. The opening maintaining structure is configured to limit the valve core to be spaced apart from the output connection port, that is, to maintain the communication between the output channel 601 and the valve core cavity 102.

[0045] In this embodiment, for the convenience of assembly, the valve body may specifically include a main body housing 1 and a rear cover support 6, which are detachably connected to each other. The main body housing 1 includes a connected horizontal main body section and an inclined main body section. An input channel 101 and an atomization channel are provided in the horizontal main body section, and a valve core cavity 102 is provided in the inclined main body section. The input channel 101 and the atomization channel may be specifically arranged horizontally, and the valve core cavity 102 may also be arranged obliquely (as long as the sliding channel of the valve core is inclined). The rear cover support 6 is connected to the main body housing 1, and an output channel 601 is provided in the rear cover support 6.

[0046] Further, the first ends of the above-mentioned slide rail body 10 are respectively connected to the rear cover support 6, that is, a space is provided between the abutting ring 11 and the rear cover support 6 along the axis direction of the valve core sliding channel, and the two ends of the slide rail body 10 are respectively connected to the abutting ring 11 and the rear cover support 6. That is, the slide rail body and the abutting ring are both integral with the rear cover support 6, and the slide rail member is used to extend into the valve core cavity 102 and form the above-mentioned valve core sliding channel in the valve core cavity 102.

[0047] In this embodiment, the plane where the axis of the input channel 101 and the axis of the valve core cavity 102 are located is the first plane, and the output channel 601 is perpendicular to the first plane. The purpose of setting the output channel 601 to be perpendicular to the input channel 101 and the valve core cavity 102 is to make the input channel 101 extend outward along the side surface of the main body housing 1, make more use of the lateral space, and thus reduce the overall length of the valve body. That is, the rear cover support 6 may be specifically arranged as an L-shaped structure, and the output channel 601 may also be arranged as an L-shaped, including a guiding channel section and a connecting channel section. The guiding channel section is used to connect the valve core cavity 102, and the length of the guiding channel section may be set to be close to the diameter of the connecting channel section, that is, the length of the guiding channel section may be reduced as much as possible to reduce the overall length of the valve body. A quick connector 8 may be further provided at the connecting channel section to connect an external pipeline.

[0048] Further, the main body housing 1 and the rear cover support 6 may be fixed by bolts 7 or may be connected by a threaded method. A connection sealing portion 5 may be provided at the connection portion between the main body housing 1 and the rear cover support 6. The connection sealing portion 5 may be an O-ring to avoid the problem of poor sealing caused by dimensional deviation when the main body housing 1 and the rear cover support 6 are connected. Of course, in other embodiments, if the dimensional deviation of the rear cover support 6 meets the requirements, the connection sealing portion 5 may not be provided.

[0049] In this embodiment, the above-mentioned opening and maintaining structure may specifically be a convex structure provided at the first end of the slide rail body 10. The convex direction of the convex structure is towards the axis of the valve core sliding channel, that is, the diameter of the valve core sliding channel near the rear cover bracket 6 is reduced, so that the valve core cannot slide further towards the rear cover bracket 6. Among them, the convex structure may actually be a rectangular convex or an arc convex.

[0050] In this embodiment, the first sealing portion may specifically include a first sealing ring 2 and a first sealing gasket 3 stacked. The first sealing ring 2 is arranged on the side close to the input connection port, specifically on the inner wall surface of the valve core cavity 102 corresponding to the input connection port and surrounds the input connection port. The first sealing gasket 3 is arranged on the side close to the abutting ring 11. The first sealing ring 2 may specifically be an O-ring, and the first sealing gasket 3 may specifically be a PTFE gasket. The PTFE gasket is provided with the above-mentioned through hole. During installation, the rear cover bracket 6 is installed on the main body housing 1. The slide rail member on the rear cover bracket 6 extends into the valve core cavity 102, and the abutting ring 11 thereon abuts and presses tightly against the PTFE gasket and the O-ring, thereby realizing the seal between the abutting ring 11 and the wall surface of the valve core cavity 102; and the valve core moves upward under the buoyancy of the fire extinguishing medium and abuts and presses tightly against the side surface of the PTFE gasket facing it and the through hole of the PTFE gasket, realizing the closing of the through hole, and thus cutting off the air flow channel.

[0051] In this embodiment, in order to further improve the closing speed and closing accuracy of the air flow channel, the cross-sectional area of the above-mentioned guiding channel section may be set to be smaller than the cross-sectional area of the valve core (that is, set to be smaller than the cross-sectional area of the valve core guiding channel), and the axis of the guiding channel section may be set to be coaxial with the axis of the valve core guiding channel. Thus, after the fire extinguishing medium enters from the connecting channel section, it is ejected from the guiding channel section towards the valve core guiding channel. The coaxial setting makes the moving direction of the fire extinguishing medium consistent with the moving track of the valve core, and the cross-sectional area of the guiding channel section is set to be smaller than the cross-sectional area of the valve core, so that the force in the liquid moving direction directly acts on the surface of the valve core.

[0052] In this embodiment, the included angle formed by the axis of the above-mentioned input channel 101 and the axis of the valve core sliding channel is 45°. That is, the included angles between the axes of the valve core sliding channel and the valve core cavity 102 and the above-mentioned installation surface are also 45°. If the included angle is greater than 45°, the overall length of the valve body increases and the installation space is limited. If the included angle is less than 45°, the atomization channel will have position interference due to its own volume requirements, and the atomization channel needs to move downward, resulting in an increase in the area of the installation surface and being not easy for the battery pack to be installed. And the 135° pipeline fold angle transition is easy for the gas to pass through and reduces the kinetic energy loss.

[0053] In this embodiment, the atomization channel may specifically include a first installation through hole opened in the valve body and an atomization nozzle 9. The first end of the first installation through hole communicates with the valve core cavity 102, and the second end of the first installation through hole penetrates the installation surface. The axis of the first installation through hole may be set parallel to the input channel 101, and the first installation through hole may be arranged below the input channel 101. The atomization nozzle 9 is installed in the first installation through hole for atomizing and ejecting the fire-fighting medium.

[0054] In this embodiment, the valve core may specifically be a spherical valve core 4 (the spherical valve core 4 slides more smoothly in the valve core sliding channels formed by each slide rail body 10), and the gravity of the spherical valve core 4 is less than the buoyancy generated by it in the fire-fighting medium. The specific material of the spherical valve core 4 may be a plastic ball core or a metal hollow ball. According to relevant design standards, the fire-fighting liquid pressure at the lowest nozzle is not less than 0.3MP, and the contact area between the spherical valve core 4 and the PTFE gasket is extremely small, and the actual pressure is far greater than 3kg to meet the sealing pressure.

[0055] Embodiment 2

[0056] On the basis of the above Embodiment 1, this embodiment provides an electric energy storage safety protection system, including a detection host, a plurality of buoyancy conversion valves as described in Embodiment 1 above, and a plurality of return air regulating valves.

[0057] The buoyancy conversion valves and the return air regulating valves correspond to the battery packs one by one. The installation surfaces of a plurality of buoyancy conversion valves are respectively installed on the corresponding battery packs. The output channels 601 of a plurality of buoyancy conversion valves are respectively connected to the input end of the detection host through pipelines. The return air regulating valve is connected in a pipeline between the output end of the detection host and the battery pack. The detection host receives the gases output by each buoyancy conversion valve, summarizes them, and conducts inhalation detection. The return air regulating valve is configured to adjust the magnitude of the return air flow rate flowing back to the battery pack to control the magnitude of the air output flow rate of the battery pack through the buoyancy conversion valve.

[0058] By arranging an input channel 101, a spool chamber 102, and an output channel 601 connected in sequence inside the valve body of the buoyancy conversion valve, setting the spool chamber 102 to be inclined with the input channel 101 higher than the output channel 601, the spool chamber 102 is configured to have an input connection port, an output connection port, a spool sliding channel, a gas communication channel, and an opening maintenance structure, and further arranging an atomization channel with a preset opening pressure and communicating with the spool chamber 102. The spool slides inside the spool sliding channel and is configured to have a detection operation configuration and a fire-fighting operation configuration. In the detection operation configuration, the spool freely falls under the action of gravity and is limited by the opening maintenance structure to be spaced from the output connection port, and the input channel 101 and the output channel 601 remain connected. In the fire-fighting operation configuration, the spool rises against gravity under the action of the fire-fighting medium input from the output channel 601 and closes the input connection port (the gas flow channel is cut off), and the fire-fighting medium pressure rises inside the spool chamber 102 and overcomes the preset opening pressure to be atomized and output through the atomization channel. Furthermore, the conversion between the gas passage and the fire-fighting medium passage without an additional power device can be realized. Compared with the existing ball valve scheme, the volume is greatly reduced, and the cost is also reduced, thus solving the problems of large volume and high cost of the battery cabinet caused by the existing electric energy storage safety protection scheme.

[0059] In this embodiment, the opening degree of the corresponding return air regulating valve can be adjusted according to each battery pack and the pipeline length between the buoyancy conversion valve and the detection host, so that the flow rates output from each battery pack to the detection host are balanced, thereby improving the detection accuracy of the detection host.

[0060] The following is a detailed description:

[0061] It is set that the gas output channel 601 of each buoyancy conversion valve outputs through an intake sub-pipeline, and the output ends of the respective intake sub-pipelines are connected to an intake main pipeline (the gases output from each conversion valve are aggregated here), and the output end of this intake main pipeline is connected to the gas input end of the detection host, so that the aggregated gases are detected and pre-warned inside the detection host.

[0062] Each detection host can be correspondingly provided with one or more groups of battery cluster modules, and each battery cluster module is composed of multiple battery packs. In order to be able to implement the gas monitoring function for all battery packs in the same cluster, it is first necessary to ensure that gas can flow into the detection host for detection for each battery pack. Since factors such as the length and inner diameter of the air pipe will affect the air flow of each box body, if the ventilation holes of multiple battery packs are the same, the air flow of the battery pack in the lower position will be smaller, or even there will be no air flow. Therefore, in order to ensure that the gas flow in each box body is the same, it is necessary to adaptively adjust the size of the ventilation hole diameter of each box body (that is, the size of the gas flow area when the return air regulating valve is opened), so as to achieve the balance of the air flow in each battery pack.

[0063] The embodiments of the present utility model have been described in detail above in conjunction with the accompanying drawings. However, the present utility model is not limited to the above embodiments. Even if various changes are made to the present utility model, provided that these changes fall within the scope of the claims of the present utility model and equivalent technologies, they still fall within the protection scope of the present utility model.

Claims

1. A buoyancy conversion valve, characterized in that: For electrochemical energy storage safety protection system, including: A valve body, wherein the valve body is provided with a mounting surface for mounting to a battery pack, the valve body is provided with a valve core cavity inclined to a horizontal plane, the valve body is provided with an input channel and an output channel connected to both ends of the valve core cavity, the height of the input channel is higher than the output channel, and the input channel penetrates to the mounting surface; One end of the valve core cavity connected to the input channel is the input connection port, and one end of the valve core cavity connected to the output channel is the output connection port; a first sealing portion is provided at the input connection port; a slide rail component extending toward the input connection port is provided at the output connection port, the slide rail component includes an abutment ring and a plurality of slide rail bodies arranged at intervals along the annular direction, and the plurality of slide rail bodies cooperate to form a valve core sliding channel, the first ends of the slide rail bodies are respectively connected to the output connection ports, and the second ends of the slide rail bodies are respectively connected to the abutment rings, and the abutment rings are configured to abut against the first sealing portion and seal the gap between the abutment ring and the inner wall of the valve core cavity; A valve core is slidably connected in the valve core sliding channel; wherein the first sealing portion is provided with a through hole connecting the input channel and the valve core cavity, and the through hole is configured to be attached to and cut off the input channel and the valve core cavity by the valve core; an atomizing channel, disposed in the valve body, wherein an input end of the atomizing channel is connected to the valve core cavity, and the atomizing channel is configured to have a preset opening pressure; The valve core is configured to switch between a detection operation configuration and a fire-fighting operation configuration; in the detection operation configuration, the valve core falls freely under the action of gravity and the valve core chamber is connected with the input channel and the output channel respectively; in the fire-fighting operation configuration, the valve core overcomes gravity to rise and close the through hole under the action of the fire-fighting medium input into the output channel, and the pressure of the fire-fighting medium in the valve core chamber overcomes the preset opening pressure and is atomized and output through the atomization channel.

2. The buoyancy conversion valve according to claim 1, characterized in that: The first sealing portion includes a first sealing ring and a first sealing gasket which are stacked; The first sealing ring is arranged on a side of the first sealing gasket facing the input connection port, and the first sealing gasket is provided with the through hole.

3. The buoyancy conversion valve according to claim 1, characterized in that: A gas communication channel connecting the input connection port and the output connection port is provided in the valve core cavity; and an opening maintaining structure is provided in the output connection port and / or the valve core sliding channel, and the opening maintaining structure is configured to limit the valve core interval to the output connection port.

4. The buoyancy conversion valve according to claim 1, characterized in that: The valve body comprises a main body shell and a rear cover bracket; The main body shell comprises a connected horizontal main body section and an inclined main body section, the horizontal main body section is provided with the input channel and the atomization channel, and the inclined main body section is provided with the valve core cavity; The rear cover bracket is connected to the main body shell, and the output channel is arranged in the rear cover bracket.

5. The buoyancy conversion valve according to claim 1, characterized in that: The plane where the axis of the input channel and the axis of the valve core chamber lie is a first plane, and the output channel is perpendicular to the first plane.

6. The buoyancy conversion valve according to claim 3, characterized in that: The opening maintaining structure is a protruding structure arranged on one side of the slide rail body close to the output connection port, and the protruding direction of the protruding structure faces the axis of the valve core sliding channel.

7. The buoyancy conversion valve according to claim 1, characterized in that: The output channel comprises a communicating guide channel section and a connecting channel section, the guide channel section is connected to the valve core cavity, and the cross-sectional area of ​​the guide channel section is smaller than the cross-sectional area of ​​the valve core.

8. The buoyancy conversion valve according to claim 1, characterized in that: The angle formed by the axis of the input channel and the axis of the valve core sliding channel is 45°.

9. The buoyancy conversion valve according to claim 1, characterized in that: The atomizing channel includes a first mounting through hole opened in the valve body and an atomizing nozzle, the first end of the first mounting through hole is connected to the valve core cavity, the second end of the first mounting through hole passes through the mounting surface, and the atomizing nozzle is installed in the first mounting through hole.

10. The buoyancy conversion valve according to claim 1, characterized in that: The valve core is a spherical valve core, and the gravity of the spherical valve core is smaller than the buoyancy generated by the spherical valve core in the fire fighting medium.

Images