CN115528321A - Fire suppression device, battery and electrical equipment - Google Patents

Abstract

The application provides a fire suppression device, battery and consumer. Wherein the fire suppression device includes a body and a pressure switch. Wherein, the body can include the cavity, includes fire control liquid in the cavity, and the side of cavity has the connecting hole, and pressure switch passes through this connecting hole and cavity intercommunication. To increase the pressure within the chamber, a pressurized gas is also included within the chamber. When the amount of the fire-fighting liquid in the cavity is larger than or equal to a preset value, the pressure in the cavity is larger than or equal to a set value by pressurizing the gas, the pressure applied to the pressure switch is larger, and the pressure switch is conducted; when the amount of the fire-fighting liquid in the cavity is reduced to be smaller than the preset value, the pressure in the cavity is smaller than the set pressure by the pressurized gas, and the pressure switch is switched off, so that whether the fire suppression device leaks or not is judged by judging the state of the pressure switch.

Description

Fire suppression device, battery and electrical equipment

technical field

The present application relates to the technical field of lithium-ion battery fire extinguishing, in particular to a fire suppression device, battery and electrical equipment.

Background technique

Lithium-ion batteries can be referred to as lithium batteries for short. Lithium batteries have the advantages of small size, light weight, and long cycle life, and are currently widely used in communication base stations, data centers, energy storage power stations, electric vehicles and other fields. With the wide application of lithium batteries, the demand for longer life of lithium batteries is also increasing.

The application battery formed by adding a protection circuit, casing and output to a lithium battery is called a battery pack. Lithium batteries are susceptible to thermal runaway due to external environmental incentives and their own manufacturing defects during use, which can cause fires. Configuring a special fire suppression device in the battery pack is one of the effective ways to reduce the consequences of thermal runaway of lithium-ion batteries and ensure the safe escape of personnel. Since the fire suppression device is a safety component, it is required to have a long service life when installed and used with the whole machine. During long-term use, a state detection function is required to ensure the reliability of the long-term operation of the fire suppression device.

Contents of the invention

The application provides a fire suppression device, a battery and electrical equipment, which can monitor in real time whether the fire suppression device is leaking.

In a first aspect, an embodiment of the present application provides a fire suppression device, which includes a main body and a pressure switch. Wherein, the body can include a cavity, which includes a fire-fighting liquid. Generally, the body is also provided with an activation part and an eruption port (the activation part and the eruption port are not shown in Figure 1), and the activation part can be activated when a fire occurs. The fire-fighting liquid is sprayed from the eruption port to extinguish the fire. The side of the cavity has a connecting hole through which the pressure switch communicates with the cavity. To increase the pressure within the cavity, the cavity also contains pressurized gas. When the amount of fire-fighting liquid in the cavity is greater than or equal to the preset value, the pressurized gas makes the pressure in the cavity greater than or equal to the set value, the pressure switch is under a greater pressure, and the pressure switch is turned on; when the body leaks , the fire-fighting liquid in the cavity decreases, the pressurized gas reduces the pressure in the cavity, and the pressure on the pressure switch decreases. When the amount of fire-fighting liquid in the cavity decreases to less than the preset value, the pressurized gas makes the cavity If the pressure is lower than the set pressure, the pressure switch is disconnected, so as to determine whether the fire suppression device leaks by judging the state of the pressure switch.

The function of "pressurized gas" in this application is to make the pressure in the cavity higher than the external pressure. The pressurized gas can be any gas that does not react with the fire fighting liquid, and it is not limited here.

In specific implementation, the gas slow-release agent can be added in the cavity of the main body under normal pressure during the assembly stage of the fire suppression device. increase. This can avoid pressurized operation during the assembly stage, thereby reducing the difficulty of assembly.

The present application does not limit the shape of the cavity of the main body. Exemplarily, the shape of the cavity may be a cube.

In a feasible implementation, the pressure switch may include a housing. The casing has a first end and a second end oppositely arranged, the second end is located outside the body, the first end extends into the cavity through the connecting hole, so that at least part of the casing is located in the cavity, wherein the cavity is located The surface of the housing inside the body also has a hollowed-out area. The present application does not limit the hollow area, which may be one larger opening or multiple small openings.

The application does not limit the position of the hollowed out area. Exemplarily, the hollowed out area may be disposed on the end face of the first end of the casing, which is not limited here.

Further, the pressure switch may further include a spring, a piston, a first electrode and a second electrode. Wherein, the spring is located in the housing, and the spring has a fixed end and a movable end, the fixed end of the spring faces the first end of the housing, and the fixed end of the spring is fixed relative to the first end of the housing; the piston is located in the housing and fixed on One end of the spring away from the cavity, and at least one side of the piston away from the spring has electrical conductivity; the first electrode and the second electrode are located in the casing and fixed to the second end of the casing. Exemplarily, the first electrode and the second electrode are arranged in isolation.

When the amount of fire-fighting liquid in the cavity is greater than or equal to the preset value, the pressurized gas makes the pressure of the cavity greater than or equal to the set pressure, and the piston is pushed under the joint action of the pressure of the cavity and the pressure outside the cavity, And move toward the direction where the second end of the housing is located, so that the piston contacts both the first electrode and the second electrode, so that the first electrode and the second electrode 125 are electrically connected through the piston, and the pressure switch is turned on. When the main body leaks, the fire-fighting liquid in the cavity decreases, the pressure in the cavity decreases, and the thrust received by the piston from the cavity gradually decreases. When the amount of fire-fighting liquid in the cavity is less than the preset value, the pressurized gas makes the The pressure inside the cavity is lower than the set pressure, so the piston is pushed and moved toward the direction of the first end of the cavity under the joint action of the pressure inside the cavity and the pressure outside the cavity, and the piston is connected to the first electrode and the second electrode disconnected, that is, the piston is not in contact with the first electrode and the second electrode, and the pressure switch is disconnected.

In this application, the end surface of the piston facing the first end of the housing is used to withstand the pressure generated by the pressure from the cavity. (that is, the first end of the housing points to the direction of the second end, and/or the second end of the housing points to the direction of the first end) to reciprocate, and the peripheral wall of the piston is in close contact with the inner wall of the housing, so that the housing is in close contact with the inner wall of the housing. The cavity forms a sealed space. When the piston moves, the peripheral wall of the piston moves relative to the inner wall of the casing to generate friction force, and the friction force is opposite to the movement direction of the piston.

Exemplarily, the material of the piston includes a metal material, such as at least one of gold, silver, copper, aluminum, molybdenum, tungsten, etc., which is not limited herein.

In a feasible implementation manner, the piston may include a flexible diaphragm, a connecting rod and a conductive sheet. The flexible membrane is fixed on the movable end of the spring, and the flexible membrane is assembled in the housing and can block a channel in the housing, wherein the channel is located between the first end and the second end of the housing. The conductive sheet is located on the side of the flexible diaphragm away from the spring; the connecting rod is located between the flexible diaphragm and the conductive sheet, and connects the flexible diaphragm and the conductive sheet.

In a specific implementation, the flexible diaphragm has two surfaces, one of which faces the first end of the housing, and the other faces the second end of the housing. The surface of the flexible membrane facing the first end of the housing is fixedly connected with the movable end of the spring, and can follow the movable end to reciprocate in the channel of the housing. The so-called reciprocating motion refers to the movement from the first end of the housing to the second end of the housing, and/or the movement from the second end of the housing to the first end of the housing. When the amount of fire-fighting liquid in the cavity is greater than or equal to the preset value, the pressurized gas makes the pressure of the cavity greater than or equal to the set pressure, and the flexible diaphragm is pushed under the joint action of the pressure of the cavity and the pressure outside the cavity The conductive sheet moves toward the direction of the second end of the casing, so that the conductive sheet contacts both the first electrode and the second electrode, so that the first electrode and the second electrode are electrically connected through the piston, and the pressure switch is turned on. When the main body leaks, the fire-fighting liquid in the cavity decreases, the pressure in the cavity decreases, and the thrust from the cavity received by the flexible diaphragm gradually decreases. When the amount of fire-fighting liquid in the cavity is less than the preset value, pressurization The gas makes the pressure in the chamber less than the set pressure, so that the flexible diaphragm pushes the flexible diaphragm to move toward the direction of the first end of the chamber under the joint action of the pressure in the chamber and the pressure outside the chamber, and the flexible diaphragm and The first electrode and the second electrode are disconnected, and the pressure switch is disconnected.

Exemplarily, the area of the flexible membrane may be larger than the area formed by the inner peripheral wall of the cross section of the housing, that is, the flexible membrane is interference-fitted with the inner wall of the housing. Since the flexible membrane is flexible, the flexible membrane can be assembled into the housing through deformation.

The present application does not limit the material of the flexible membrane. Exemplarily, the material of the flexible membrane may include rubber material and the like.

In another feasible implementation manner, the piston may include a plug body and at least one annular sealing ring sleeved on the plug body, the plug body is fixed to the movable end of the spring, and the plug body has at least one side away from the spring. Conductivity; each annular sealing ring is in close contact with the inner wall of the housing. In this implementation, the sealability between the piston and the inner wall of the housing can be improved by providing an annular sealing ring. The present application does not limit the number of annular sealing rings, generally two to three annular sealing rings can be provided.

In a specific implementation, when the piston includes a plurality of annular sealing rings, the plurality of annular sealing rings can be arranged independently of each other, of course, the plurality of annular sealing rings can also be arranged in an integrated structure, which is not limited herein.

Further, in this application, in order to increase the sealing performance between the plug body and the annular sealing ring and to prevent the annular sealing ring from falling off from the plug body when the plug body is moving, the plug body and the annular sealing ring can be set as an integral structure, Alternatively, threads are provided on the peripheral wall of the plug body, and the annular sealing ring is sleeved on the threads.

During specific implementation, the annular sealing ring can generally be formed of flexible materials such as rubber, which is not limited here.

Exemplarily, the material of the plug body includes a metal material, such as at least one of gold, silver, copper, aluminum, molybdenum, tungsten, etc., which is not limited herein.

Further, the fire suppression device provided in the embodiment of the present application may also include a controller; correspondingly, the pressure switch also includes a first electrode connection end and a second electrode connection end located outside the casing; wherein, the first electrode connection terminal is electrically connected to the first electrode, and the second electrode connection end is electrically connected to the second electrode; the controller is electrically connected to the first electrode connection end and the second electrode connection end, and the controller is used to output the first signal when the pressure switch is disconnected , the first signal is used to indicate that the amount of fire fighting liquid in the cavity is less than a preset value.

Exemplarily, the controller can also be configured to output a second signal when the pressure switch is turned on, and the second signal is used to indicate that the amount of fire fighting liquid in the cavity is greater than or equal to a preset value.

In specific implementation, the controller is the same as the first electrode connection end and the second electrode connection end of the pressure switch, and the controller can send the first signal or the second signal to the monitoring device or APP, so that the monitoring device or APP can The first signal or the second signal generates a corresponding indication.

In the second aspect, the embodiment of the present application also provides another fire suppression device, which includes a main body, a magnetic float and a reed switch. Wherein, the main body includes a cavity, and the cavity includes a fire-fighting liquid, and the main body is generally provided with an activation part and an eruption port. When a fire occurs, the activation part can be activated to make the fire-fighting liquid spray out from the eruption port to extinguish the fire. The magnetic float is located in the cavity and can rise with the rise of the fire fighting liquid level. Decrease with the liquid level of the fire fighting liquid; the dry reed switch is fixedly connected with the body, when the amount of fire fighting liquid in the cavity is greater than or equal to the preset value, the magnetic field strength of the magnetic float acting on the dry reed switch is greater than or equal to the set value value, so as to drive the reed switch to conduct; when the body leaks, the fire-fighting liquid in the cavity decreases, the position of the magnetic float decreases with the drop of the fire-fighting liquid level, and the distance between the magnetic float and the reed switch increases. The intensity of the magnetic field that the magnetic float acts on the reed switch is reduced. When the amount of fire-fighting liquid in the cavity is less than the preset value, the magnetic field strength of the magnetic float acting on the reed switch is less than the set value, and the magnetic field generated by the magnetic float loses its ability to control the reed switch, and the reed switch is disconnected, thereby By judging the state of the reed switch, it is judged whether the fire suppression device leaks.

The application does not limit the structure of the reed switch. In practice, a reed switch usually includes two magnetizable reeds. The two reeds are packaged in a glass tube filled with inert gas (such as neon, helium, etc.) or vacuum. When the amount of fire-fighting liquid in the cavity is greater than or equal to the preset value, the distance between the magnetic float and the reed switch is less than or equal to the set distance, and the magnetic field generated by the magnetic float is stronger at the two reed positions of the reed switch. Large, can make the two reeds have different polarities, so that the two reeds with different polarities will attract and close each other, and the dry reed switch will be turned on. When the body leaks, the fire-fighting liquid in the cavity decreases, and the position of the magnetic float decreases with the drop of the fire-fighting liquid level. The distance between the magnetic float and the reed switch gradually increases, and the magnetic field generated by the magnetic float is in the reed switch. The magnetic field intensity at the positions of the two reeds gradually decreases. When the amount of fire-fighting liquid in the cavity is less than the preset value, the distance between the magnetic float and the reed switch is greater than the set distance, the magnetic field generated by the magnetic float loses control over the reed switch, and the reed switch is disconnected.

In specific implementation, the body can be a cuboid design, and the body can be placed horizontally or vertically. In this application, no matter whether the body is placed horizontally or vertically, the magnetic float can drop along the liquid level of the fire-fighting liquid under the action of the buoyancy of the fire-fighting liquid. direction to move.

The preset value in this application can be designed according to the actual product, for example, the preset value is 90%, 80% or 70% of the total amount of fire fighting liquid when no liquid leakage occurs in the cavity, etc., which is not limited here.

In specific implementation, the dry reed switch can be fixed outside the body; of course, the dry reed switch is also fixed in the cavity.

When the reed switch is fixed in the cavity, the magnetic float and the reed switch can be integrated into one device, which can be installed in the body through threads, which is not limited here.

Exemplarily, a cylinder can be arranged in the cavity, and the magnetic float is sleeved on the cylinder, so that the magnetic float can only move along the cylinder under the buoyancy of the fire fighting liquid. Exemplarily, a through hole may be provided in the magnetic float, and the column passes through the through hole.

Exemplarily, in order to reduce the frictional force between the column and the magnetic float, the diameter of the through hole may be set to be larger than the diameter of the column.

Further, the fire suppression device provided in the embodiment of the present application may also include a controller; the controller is electrically connected to the reed switch, and the controller is used to output a first signal when the reed switch is disconnected, and the first signal is used to indicate The amount of fire fighting liquid in the cavity is less than a preset value.

Exemplarily, the controller can also be configured to output a second signal when the reed switch is turned on, and the second signal is used to indicate that the amount of fire fighting liquid in the cavity is greater than or equal to a preset value.

During specific implementation, the controller may send the first signal or the second signal to the monitoring device or APP, so that the monitoring device or APP may generate a corresponding indication according to the first signal or the second signal.

In the third aspect, the embodiment of the present application also provides a battery, including a box and the fire suppression device according to the various implementations of the first aspect and the second aspect arranged in the box. A battery module is generally arranged in the cabinet. Wherein, the fire suppression device includes a main body and a liquid leakage detection module, and when a fire occurs in the battery module, the main body can extinguish the fire. A pressure switch or a reed switch is installed in the fire suppression device, and the pressure switch or reed switch can be used to judge whether there is liquid leakage in the body, so as to ensure the reliability of the long-term operation of the fire suppression device.

Exemplarily, the battery may further include a battery management module disposed in the case, and the controller may be integrated in the battery management module.

In actual implementation, the present application does not limit the specific position of the fire suppression device in the box, and it can be designed according to the actual product.

In a fourth aspect, the present application also provides an electric device, which includes a casing and the battery described in various implementations of the above third aspect contained in the casing, for example, the electric device is a storage battery Energy base stations, consumer electronics (such as mobile phones, tablets or wearable devices), and electric vehicles. Or the electrical equipment includes a housing and the fire suppression devices described in the various implementations of the first aspect to the second aspect contained in the housing, for example, the electrical equipment is a power distribution cabinet or a power exchange cabinet.

The technical effects that can be achieved by the above third aspect and the second aspect can be described with reference to the technical effects that can be achieved by any possible design of the above first aspect and the second aspect, and will not be repeated here.

Description of drawings

Figure 1 is a schematic structural view of a fire suppression device provided by an embodiment of the present application;

Fig. 2 is a side structural schematic diagram of a fire suppression device provided by an embodiment of the present application;

Fig. 3 is a side structural schematic diagram of a fire suppression device provided by another embodiment of the present application;

Fig. 4 is a schematic structural diagram of a pressure switch provided by an embodiment of the present application when it is turned on;

Fig. 5 is a structural schematic diagram when the pressure switch shown in Fig. 4 is disconnected;

Fig. 6 is a schematic structural diagram of a pressure switch provided in another embodiment of the present application when it is turned on;

Fig. 7 is a structural schematic diagram when the pressure switch shown in Fig. 6 is disconnected;

Fig. 8 is a schematic structural diagram of a pressure switch provided in another embodiment of the present application;

Fig. 9 is a schematic cross-sectional structure diagram of the piston in the pressure switch shown in Fig. 8;

Fig. 10 is a schematic structural diagram of a fire suppression device provided in another embodiment of the present application;

Fig. 11 is a schematic structural diagram of a fire suppression device provided in another embodiment of the present application;

Fig. 12 is a schematic structural diagram of a fire suppression device provided in another embodiment of the present application;

Fig. 13 is a schematic diagram of the structure when the reed switch is disconnected in the fire suppression device provided by an embodiment of the present application;

Fig. 14 is a schematic structural diagram of a fire suppression device provided by an embodiment of the present application when the reed switch is turned on;

Fig. 15 is a schematic side view of the fire suppression device provided by an embodiment of the present application;

Fig. 16 is a schematic side view of the fire suppression device provided by another embodiment of the present application;

Fig. 17 is a schematic top view of the magnetic float in the fire suppression device shown in Fig. 13;

Fig. 18 is a schematic structural view of a fire suppression device provided by another embodiment of the present application;

Fig. 19 is a schematic structural diagram of a battery provided by an embodiment of the present application;

Fig. 20 is a schematic structural diagram of an electrical device provided by an embodiment of the present application;

Fig. 21 is a schematic structural diagram of an electrical device provided by another embodiment of the present application.

Explanation of reference signs:

10-fire suppression device; 11-body; 12-pressure switch; 111-connection hole; 112-starting part; 113-ejection port; 121-housing; 125-second electrode; 126-first electrode connection end; 127-second electrode connection end; 1231-flexible diaphragm; 1232-connecting rod; 1233-conductive sheet; 1234-plug body; Sealing ring; 13-controller; 141-magnetic float; 142-reed switch; 143-cylinder; 1-battery; 20-box; 30-battery management module;

detailed description

In order to make the purpose, technical solution and advantages of the application clearer, the application will be further described in detail below in conjunction with the accompanying drawings. Example embodiments may, however, be embodied in many forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this application will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The same reference numerals denote the same or similar structures in the drawings, and thus their repeated descriptions will be omitted. The words expressing position and direction described in this application are all described by taking the accompanying drawings as an example, but changes can also be made according to needs, and all changes are included in the protection scope of this application. The drawings in this application are only used to illustrate the relative positional relationship and do not represent the true scale.

It should be noted that specific details are set forth in the following description to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described here, and those skilled in the art can make similar promotions without departing from the connotation of the present application. The present application is therefore not limited by the specific embodiments disclosed below. The subsequent description of the specification is a preferred implementation mode for implementing the application, but the description is for the purpose of illustrating the general principle of the application, and is not intended to limit the scope of the application. The scope of protection of the present application should be defined by the appended claims.

In order to facilitate the understanding of the negative electrode sheet of the lithium-ion battery, the lithium-ion battery, and the electrical equipment provided in the embodiments of the present application, the following first introduces its application scenarios. During the use of electrical equipment, a power supply device is usually required for power supply. At present, relatively small electrical equipment, especially mobile electrical equipment, usually chooses lithium-ion batteries as the power supply device. Lithium-ion batteries have high energy density, long cycle life, and low self-discharge rate. However, lithium-ion batteries are susceptible to thermal runaway due to external environmental incentives and their own manufacturing defects, which can cause fires. Configuring a special fire suppression device in the battery pack is one of the effective ways to reduce the consequences of thermal runaway of lithium-ion batteries and ensure the safe escape of personnel. Since the fire suppression device is a safety component, it is required to have a long service life when installed and used with the whole machine. During long-term use, a state detection function is required to ensure the reliability of the long-term operation of the fire suppression device. At present, the industry mainly uses air pressure, liquid level and ultrasonic methods to detect whether there is liquid leakage in fire fighting equipment. However, these methods are not applicable to the state detection of the fire suppression device built in the current battery pack. The main problem is that the fire suppression device is small in size and installed inside the battery pack, so it cannot be detected by ultrasound, and the screw installation cannot test the weight. Pressure vessels, not suitable for pressure testing solutions.

In view of this, the present application proposes a fire suppression device, a battery and electrical equipment, which can monitor in real time whether the fire suppression device is leaking. The application will be described in further detail below in conjunction with the accompanying drawings.

Fig. 1 is a schematic structural diagram of a fire suppression device provided by an embodiment of the present application. As shown in FIG. 1 , the fire suppression device 10 provided by the embodiment of the present application includes a main body 11 and a pressure switch 12 . Wherein, the body 11 may include a cavity, and the cavity includes a fire-fighting liquid. Generally, the body 11 is also provided with an activation part and an eruption port (the activation part and the eruption port are not shown in FIG. 1 ), which can be activated when a fire occurs. The fire-fighting liquid is sprayed from the eruption port to extinguish the fire. The side of the cavity has a connecting hole 111 through which the pressure switch 12 communicates with the cavity. To increase the pressure within the cavity, the cavity also contains pressurized gas. When the amount of fire-fighting liquid in the cavity is greater than or equal to the preset value, the pressurized gas makes the pressure in the cavity greater than or equal to the set value, the pressure switch 12 is under a greater pressure, and the pressure switch 12 is turned on; After the liquid leaks, the fire-fighting liquid in the cavity decreases, and the pressurized gas reduces the pressure in the cavity, and the pressure on the pressure switch 12 decreases. When the amount of fire-fighting liquid in the cavity decreases to less than the preset value, pressurize The gas makes the pressure in the cavity lower than the set pressure, and the pressure switch 12 is turned off, so that whether the fire suppression device 10 leaks is judged by judging the state of the pressure switch 12 .

The preset value in this application can be designed according to the actual product, for example, the preset value is 90%, 80% or 70% of the total amount of fire fighting liquid when no liquid leakage occurs in the cavity, etc., which is not limited here.

For example, refer to Fig. 2 and Fig. 3, Fig. 2 is a schematic side structure diagram of a fire suppression device provided by an embodiment of the present application; Fig. 3 is a schematic side structure diagram of a fire suppression device provided by another embodiment of the present application. The connection hole 111 may be disposed on a side of the main body 11 where the activation portion 112 or the ejection port 113 is disposed. In practice, the activation part 112 and the ejection port 113 are generally disposed on the same side of the main body 11 . In this way, the connection hole 111 , the activation part 112 and the injection port 113 can all be arranged on the same side of the main body 11 .

The function of "pressurized gas" in this application is to make the pressure in the cavity higher than the external pressure. The pressurized gas can be any gas that does not react with the fire fighting liquid, and it is not limited here.

In practice, during the assembly stage of the fire suppression device 10, a gas slow-release agent can be added in the cavity of the main body 11 under normal pressure. Internal pressure increases. This can avoid pressurized operation during the assembly stage, thereby reducing the difficulty of assembly.

The present application does not limit the shape of the cavity of the body 11 , for example, the shape of the cavity may be a cube.

In a feasible implementation, refer to Fig. 4 to Fig. 7, Fig. 4 is a schematic structural diagram of the pressure switch provided by an embodiment of the present application when it is turned on; Fig. 5 is a schematic diagram of the pressure switch shown in Fig. 4 when it is turned off Schematic diagram of the structure; FIG. 6 is a schematic diagram of the structure of the pressure switch provided by another embodiment of the present application when it is turned on; FIG. 7 is a schematic diagram of the structure of the pressure switch shown in FIG. 6 when it is turned off. The pressure switch 12 may include: a housing 121 . The shell 121 has a first end and a second end oppositely arranged, the second end is located outside the body 11, and the first end extends into the cavity through the connecting hole 111, so that at least part of the shell 121 is located in the cavity, wherein , the surface of the casing 121 located in the cavity also has a hollow area A. The present application does not limit the hollow area A, which may be one larger opening or multiple small openings.

The present application does not limit the position of the hollow area A, which may be provided on the side surface of the housing 121 or on the end surface of the housing 121 . Exemplarily, the hollow area A may be provided at the end surface of the housing 121 , that is, at the first end of the housing, which is not limited herein.

Continuing to refer to FIGS. 4 to 7 , the pressure switch 12 may further include a spring 122 , a piston 123 , a first electrode 124 and a second electrode 125 . Wherein, the spring 122 is located in the housing 121, and the spring 122 has a fixed end and a movable end, the fixed end of the spring 122 faces the first end of the housing 121, and the fixed end of the spring 122 is fixed relative to the first end of the housing 121. The piston 123 is located in the housing 121 and is fixed on the end of the spring 122 away from the cavity, and the piston 123 has conductivity at least on the side away from the spring 122; the first electrode 124 and the second electrode 125 are located in the housing 121 and are fixed on the the second end of the housing. Exemplarily, the first electrode 124 and the second electrode 125 are arranged in isolation.

As shown in Figure 4 and Figure 6, when the amount of the fire fighting liquid in the cavity is greater than or equal to the preset value, the pressurized gas makes the pressure of the cavity greater than or equal to the set pressure, and the piston 123 is in the pressure of the cavity and the pressure of the cavity Under the combined action of the pressure outside the body, it is pushed and moves toward the direction of the second end of the housing 121 (the direction of the arrow to the right in the figure), so that the piston 123 is in contact with both the first electrode 124 and the second electrode 125, The first electrode 124 and the second electrode 125 are electrically connected through the piston 123, and the pressure switch 12 is turned on. As shown in Figures 5 and 7, when the body 11 leaks, the fire-fighting liquid in the cavity decreases, the pressure in the cavity decreases, and the thrust from the cavity received by the piston 123 gradually decreases. When the fire-fighting liquid in the cavity When the amount is less than the preset value, the pressurized gas makes the pressure in the cavity less than the set pressure, so that the piston 123 is pushed towards the first end of the cavity under the joint action of the pressure in the cavity and the pressure outside the cavity. direction (arrow direction to the left in the figure), the piston 123 is disconnected from the first electrode 124 and the second electrode 125, that is, the piston 123 is not in contact with the first electrode 124 and the second electrode 125, and the pressure switch 12 is disconnected.

In the present application, the end surface of the piston 123 facing the first end of the housing 121 is used to bear the pressure generated by the pressure from the cavity, and under the joint action of the pressure inside the cavity and the pressure outside the cavity, the piston 123 will move along the housing 121. The direction of passage (that is, the direction in which the first end of the housing 121 points to the second end, and/or the direction in which the second end of the housing 121 points to the first end) reciprocates, and the peripheral wall of the piston 123 is in contact with the direction of the housing 121 The inner wall is in close contact, so that the casing 121 and the cavity form a sealed space. When the piston 123 moves, the peripheral wall of the piston 123 moves relative to the inner wall of the housing 121 to generate friction force, and the friction force is opposite to the movement direction of the piston 123 .

Exemplarily, the material of the piston 123 includes a metal material, such as at least one of gold, silver, copper, aluminum, molybdenum, tungsten, etc., which is not limited herein.

In a feasible implementation manner, as shown in FIG. 6 and FIG. 7 , the piston 123 may include a flexible membrane 1231 , a connecting rod 1232 and a conductive sheet 1233 . The flexible membrane 1231 is fixed on the movable end of the spring 122, and the flexible membrane 1231 is assembled in the housing 121 and can block the channel in the housing 121, wherein the channel is located between the first end and the second end of the housing . The conductive piece 1233 is located on the side of the flexible membrane 1231 away from the spring 122 ; the connecting rod 1232 is located between the flexible membrane 1231 and the conductive piece 1233 and connects the flexible membrane 1231 and the conductive piece 1233 .

In a specific implementation, the flexible membrane 1231 has two surfaces, one of which is facing the first end of the housing 121 , and the other is facing the second end of the housing 121 . The surface of the flexible membrane 1231 facing the first end of the housing 121 is fixedly connected with the movable end of the spring 122 , and can follow the movable end to reciprocate in the channel of the housing 121 . The so-called reciprocating motion refers to the movement from the first end of the housing 121 to the second end of the housing 121 , and/or the movement from the second end of the housing 121 to the first end of the housing 121 . As shown in Figure 6, when the amount of fire-fighting liquid in the cavity is greater than or equal to the preset value, the pressurized gas makes the pressure of the cavity greater than or equal to the set pressure, and the flexible diaphragm 1231 is between the pressure of the cavity and the pressure outside the cavity. Under the combined action of the pressure, the conductive sheet 1233 is pushed toward the direction where the second end of the housing 121 is located (the direction of the arrow pointing to the right in the figure), so that the conductive sheet 1233 is in contact with both the first electrode 124 and the second electrode 125 , so that the first electrode 124 and the second electrode 125 are electrically connected through the piston 123, and the pressure switch 12 is turned on. As shown in Figure 7, when the body 11 leaks, the fire-fighting liquid in the cavity decreases, the pressure in the cavity decreases, and the thrust from the cavity received by the flexible diaphragm 1231 gradually decreases. When the amount of fire-fighting liquid in the cavity When it is less than the preset value, the pressurized gas makes the pressure in the cavity less than the set pressure, so that the flexible diaphragm 1231 pushes the flexible diaphragm 1231 toward the first position of the cavity under the joint action of the pressure in the cavity and the pressure outside the cavity. The direction where the end is located (the direction of the arrow to the left in the figure), the flexible diaphragm 1231 is disconnected from the first electrode 124 and the second electrode 125, and the pressure switch 12 is disconnected.

Exemplarily, referring to FIG. 6 and FIG. 7 , the area of the flexible membrane 1231 may be larger than the area formed by the inner peripheral wall of the cross section of the housing 121 , that is, the flexible membrane 1231 is interference fit with the inner wall of the housing 121 . Since the flexible membrane 1231 is flexible, the flexible membrane 1231 can be assembled into the housing 121 through deformation. FIG. 6 and FIG. 7 show schematic diagrams of the flexible membrane 1231 being assembled into the housing 121 .

The present application does not limit the material of the flexible membrane 1231 , for example, the material of the flexible membrane 1231 may include rubber material and the like.

In another feasible implementation, refer to Fig. 8 and Fig. 9, Fig. 8 is a schematic structural diagram of a pressure switch provided by an embodiment of the present application; Fig. 9 is a schematic cross-sectional structural diagram of the piston in the pressure switch shown in Fig. 8 . The piston 123 may include a plug body 1234 and at least one annular sealing ring 1235 sleeved on the plug body 1234, the plug body 1234 is fixed on the movable end of the spring 122, and the plug body 1234 is electrically conductive at least on the side away from the spring 122 ; Each annular sealing ring 1235 is in close contact with the inner wall of the housing 121 . In this implementation, the sealing performance between the piston and the inner wall of the casing can be improved by providing the annular sealing ring 1235 . The present application does not limit the number of annular sealing rings 1235 , generally two to three annular sealing rings 1235 can be provided. 8 and 9 take the piston 123 with two annular sealing rings 1230 as an example for illustration.

In a specific implementation, when the piston 123 includes a plurality of annular sealing rings 1235, as shown in Figure 8, the plurality of annular sealing rings 1235 can be arranged independently of each other, of course, the plurality of annular sealing rings 1235 can also be arranged in an integrated structure, It is not limited here.

Further, in this application, in order to increase the sealing performance between the plug body 1234 and the annular sealing ring 1235 and prevent the annular sealing ring 1235 from falling off from the plug body 1234 when the plug body 1234 moves, the plug body 1234 and the annular sealing ring can be sealed together. The ring 1235 is provided as an integral structure, or as shown in FIG. 9 , threads are provided on the peripheral wall of the plug body 1234, and the annular sealing ring 1235 is sleeved on the threads.

During specific implementation, the annular sealing ring 1230 may generally be formed of flexible materials such as rubber, which is not limited herein.

Exemplarily, the material of the plug body 1234 includes a metal material, such as at least one of gold, silver, copper, aluminum, molybdenum, tungsten, etc., which is not limited herein.

Further, referring to Fig. 4 to Fig. 7, the pressure switch 12 may also include a first electrode connection end 126 and a second electrode connection end 127, and both the first electrode connection end 126 and the second electrode connection end 127 are arranged on the casing Outside the body 121 , the first electrode connection end 126 is electrically connected to the first electrode 124 , and the second electrode connection end 127 is electrically connected to the second electrode 125 . The pressure switch 12 can be electrically connected to other electrical devices through the first electrode connection end 126 and the second electrode connection end 127 .

Further, referring to FIG. 10 and FIG. 11 , FIG. 10 is a schematic structural diagram of a fire suppression device provided by another embodiment of the present application; FIG. 11 is a schematic structural diagram of a fire suppression device provided by another embodiment of the present application. The fire suppression device 10 provided in this embodiment may also include a controller 13; the controller 13 is electrically connected to the pressure switch 12, and the controller 13 is used to output a first signal when the pressure switch 12 is disconnected, and the first signal is used for Indicates that the amount of fire fighting liquid in the cavity is less than the preset value.

Exemplarily, the controller 13 can also be configured to output a second signal when the pressure switch 12 is turned on, and the second signal is used to indicate that the amount of fire fighting liquid in the cavity is greater than or equal to a preset value.

In specific implementation, the controller 13 is respectively connected to the first electrode connection end 126 and the second electrode connection end 127 of the pressure switch 12, and the controller 13 can send the first signal or the second signal to the monitoring device or APP, thereby monitoring The device or APP may generate a corresponding indication according to the first signal or the second signal.

Based on the same technical idea, the embodiment of the present application also provides another fire suppression device 10 , see FIG. 12 , which is a schematic structural diagram of a fire suppression device provided in another embodiment of the present application. The fire suppression device 10 includes a body 11 , a magnetic float 141 and a reed switch 142 . Wherein, the main body 11 includes a cavity, which includes a fire-fighting liquid, and the main body 11 is generally also provided with an activation part and an eruption port (the activation part and the eruption opening are not shown in Figure 12), and the activation can be activated when a fire occurs. The fire-fighting liquid is sprayed from the eruption port to extinguish the fire. The magnetic float 141 is located in the cavity, and can rise with the rise of the liquid level of the fire-fighting liquid, and descend with the decline of the liquid level of the fire-fighting liquid. The dry reed switch 142 is fixedly connected with the body, as shown in Figure 13, when the amount of fire fighting liquid in the cavity is greater than or equal to the preset value, the magnetic field strength of the magnetic float 141 acting on the reed switch 142 is greater than or equal to the set value, and the magnetic force The magnetic field generated by the float 141 can drive the reed switch 142 to conduct; as shown in Figure 14, when the body 11 leaks, the fire-fighting liquid in the cavity decreases, and the position of the magnetic float 141 decreases with the drop of the fire-fighting liquid level , the distance between the magnetic float 141 and the reed switch 142 increases, and the intensity of the magnetic field that the magnetic float 141 acts on the reed switch 142 decreases. When the amount of the fire-fighting liquid in the cavity is less than the preset value, the magnetic field strength of the magnetic float 141 acting on the reed switch 142 is less than the set value, and the magnetic field generated by the magnetic float 141 loses the control ability to the dry reed switch 142, and the reed switch The tube 142 is disconnected, so as to determine whether the fire suppression device 10 leaks by judging the state of the reed switch 142 .

The application does not limit the specific structure of the reed switch. In practice, a reed switch usually includes two magnetizable reeds. The two reeds are packaged in a glass tube filled with inert gas (such as neon, helium, etc.) or vacuum. When the amount of fire-fighting liquid in the cavity is greater than or equal to the preset value, the magnetic field strength that the magnetic force float 141 acts on the reed switch 142 is greater than or equal to the set value, so that the magnetic field generated by the magnetic force float 141 is on both sides of the reed switch 142. The magnetic field strength at the position of the reed is relatively strong, which can cause the two reeds to have different polarities, so that the two reeds with different polarities will attract and close each other, and the reed switch 142 is turned on. When the body 11 leaks, the fire-fighting liquid in the cavity decreases, and the position of the magnetic float 141 decreases along with the liquid level of the fire-fighting liquid. The strength of the magnetic field at the two reed positions of the reed switch 142 gradually decreases. When the amount of the fire-fighting liquid in the cavity is less than the preset value, the magnetic field strength of the magnetic float 141 acting on the reed switch 142 is less than the set value, and the magnetic field generated by the magnetic float 141 loses the control ability to the dry reed switch 142, and the reed switch Tube 142 is disconnected.

For example, refer to Fig. 15 and Fig. 16, Fig. 15 is a schematic side structure diagram of a fire suppression device provided by an embodiment of the present application; Fig. 16 is a schematic side structure diagram of a fire suppression device provided by another embodiment of the present application. The activation part 112 and the ejection port 113 are generally disposed on the same side of the body 11 . The main body 11 can be a rectangular parallelepiped. The main body 11 can be placed horizontally as shown in FIG. 15 or vertically as shown in FIG. Under the action, all can move along the direction (arrow direction in the figure) that the liquid level of the fire fighting liquid drops.

The preset value in this application can be designed according to the actual product, for example, the preset value is 90%, 80% or 70% of the total amount of fire fighting liquid when no liquid leakage occurs in the cavity, etc., which is not limited here.

In actual implementation, as shown in FIG. 12 , the reed switch 142 can be fixed outside the body; of course, the reed switch 142 can also be fixed in the cavity.

When the reed switch is fixed in the cavity, the magnetic float 141 and the reed switch 142 can be integrated into one component, which can be installed in the body 11 through threads, which is not limited here.

For example, refer to FIG. 13 , FIG. 14 and FIG. 17 . FIG. 17 is a schematic top view of the magnetic float 141 in the fire suppression device 10 shown in FIG. 13 and FIG. 14 . A cylinder 143 may be provided in the cavity, and the magnetic float 141 is sleeved on the cylinder 143, so that the magnetic float 141 can only move along the cylinder 143 under the buoyancy of the fire fighting liquid. Exemplarily, a through hole may be provided in the magnetic float 141 , and the column 143 passes through the through hole.

Exemplarily, in order to reduce the friction between the cylinder 143 and the magnetic float 141 , as shown in FIG. 17 , the diameter of the through hole can be set to be larger than the diameter of the cylinder 143 .

Further, referring to FIG. 18 , FIG. 18 is a schematic structural diagram of a fire suppression device 10 provided in another embodiment of the present application. The fire suppression device 10 provided by this embodiment may also include a controller 13; the controller 13 is electrically connected to the reed switch 142, and the controller 13 is used to output a first signal when the reed switch 142 is disconnected, and the first signal is used Yu indicates that the amount of fire-fighting liquid in the chamber is less than a preset value.

Exemplarily, the controller 13 can also be configured to output a second signal when the reed switch 142 is turned on, and the second signal is used to indicate that the amount of fire fighting liquid in the cavity is greater than or equal to a preset value.

During specific implementation, the controller 13 may send the first signal or the second signal to the monitoring device or APP, so that the monitoring device or APP may generate a corresponding indication according to the first signal or the second signal.

The embodiment of the present application also provides a battery, see FIG. 19, which is a schematic structural diagram of a battery provided in an embodiment of the present application; A fire suppression device 10 in one embodiment. A battery module (not shown in the figure) is generally provided in the box body 20 . When a fire occurs in the battery module, the main body 11 can extinguish the fire. The fire suppression device 10 is provided with a pressure switch 12 or a reed switch 142 , and the pressure switch 12 or the reed switch 142 can be used to determine whether there is liquid leakage in the body 11 , thereby ensuring the reliability of the long-term operation of the fire suppression device 10 .

Exemplarily, referring to FIG. 19 , the battery 1 may further include a battery management module 30 disposed in the box 20 , and the controller 13 may be integrated in the battery management module 30 .

In actual implementation, the present application does not limit the specific position of the fire suppression device 10 in the box body 20 , and it can be designed according to the actual product.

In specific implementation, the battery 1 in the present application may be a lithium-ion battery, a lead-acid battery, a sodium battery, a magnesium battery, an aluminum battery, a potassium battery, etc., and is not limited herein.

The present application also provides an electric device 100. Referring to FIG. 20, the electric device 100 includes a casing 101 and the battery 1 in any of the above-mentioned embodiments accommodated in the casing 101. For example, the electric device 100 is Energy storage base stations, consumer electronics (such as mobile phones, tablets or wearable devices), and electric vehicles. Since the problem-solving principle of the electrical device 100 is similar to that of the aforementioned battery 1 , the implementation of the electrical device 100 can refer to the aforementioned implementation of the battery 1 , and repeated descriptions will not be repeated.

The present application also provides another electrical equipment 100, referring to Fig. 21, the electrical equipment 100 includes a casing 101 and the fire suppression device 10 in any of the above-mentioned embodiments accommodated in the casing 101, for example, the electrical The device 100 is a power distribution cabinet or a power exchange cabinet. Since the problem-solving principle of the electric device 100 is similar to that of the aforementioned fire suppression device 10, the implementation of the electric device 100 can refer to the implementation of the aforementioned fire suppression device 10, and repeated descriptions will not be repeated.

Obviously, those skilled in the art can make various changes and modifications to the application without departing from the spirit and scope of the application. In this way, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalent technologies, the present application is also intended to include these modifications and variations.

Claims (13)

1. A fire suppression device, characterized in that it comprises a body and a pressure switch; wherein: The body includes a cavity, the cavity includes fire-fighting liquid and pressurized gas, and the side of the cavity has connection holes; the pressurized gas is used for the amount of the fire-fighting liquid in the cavity to be greater than or equal to the preset value, make the pressure in the cavity greater than or equal to the set pressure, and when the amount of the fire-fighting liquid in the cavity is less than the preset value, make the pressure in the cavity The pressure is less than the set pressure; The pressure switch communicates with the cavity through the connection hole; the pressure switch is used for conduction when the pressure in the cavity is greater than or equal to the set pressure, and the pressure in the cavity is lower than the set pressure. Disconnect at the above set pressure. 2. The fire suppression device of claim 1, wherein the pressure switch includes a housing; The housing has a first end and a second end oppositely arranged, the second end is located outside the body, and the first end extends into the cavity through the connecting hole, so that at least A part of the housing is located in the cavity; wherein, the surface of the housing located in the cavity has a hollow area. 3. The fire suppression device of claim 2, wherein the pressure switch further comprises: a spring, the spring is located in the housing and has a fixed end and a movable end, the fixed end of the spring is fixed relative to the first end of the housing; a piston, the piston is located in the housing and fixed to the movable end of the spring, and the piston has electrical conductivity at least on one side away from the spring; a first electrode and a second electrode arranged in isolation, the first electrode and the second electrode are located in the housing and fixed to the second end of the housing, When the amount of the fire-fighting liquid in the cavity is greater than or equal to the preset value, the pressurized gas makes the pressure in the cavity greater than or equal to the set pressure, and the piston is in the The pressure inside the cavity and the pressure outside the cavity are pushed and moved toward the direction where the second end of the housing is located, so as to be in contact with both the first electrode and the second electrode; When the amount of the fire-fighting liquid in the cavity is less than the preset value, the pressurized gas makes the pressure in the cavity less than the set pressure, and the pressure of the piston in the cavity Under the joint action of the pressure outside the cavity, it is pushed and moves toward the direction where the first end of the housing is located, so as to avoid contact with both the first electrode and the second electrode. 4. The fire suppression device according to claim 3, wherein the piston comprises a plug body and at least one annular sealing ring sleeved on the outside of the plug body; The plug body is fixed to the movable end of the spring, and the plug body is electrically conductive at least on a side away from the spring; Each of the at least one annular sealing ring is in tight contact with the inner wall of the housing. 5. The fire suppression device according to claim 3, wherein the piston comprises a flexible diaphragm, a connecting rod and a conductive sheet; The flexible membrane is fixed to the movable end of the spring, and the flexible membrane is assembled in the housing and can block a channel in the housing, the channel is located at the first end of the housing and the second end; The conductive sheet is located on the side of the flexible diaphragm away from the spring; The connecting rod is located between the flexible membrane and the conductive sheet, and connects the flexible membrane and the conductive sheet. 6. The fire suppression device according to claim 5, wherein the area of the flexible diaphragm is larger than the area formed by the inner peripheral wall of the cross section of the housing. 7. The fire suppression device according to any one of claims 1-6, further comprising a controller; the pressure switch further comprising a first electrode connection terminal and a second electrode connection terminal located outside the casing end, the first electrode connection end is electrically connected to the first electrode, and the second electrode connection end is electrically connected to the second electrode; The controller is electrically connected to the first electrode connection end and the second electrode connection end respectively, and the controller is used to output a first signal when the pressure switch is disconnected, and the first signal is used to indicate The amount of the fire fighting liquid in the cavity is less than the preset value. 8. A fire suppression device, characterized in that it includes a body, a magnetic float and a reed switch; wherein: The body includes a cavity, and the cavity includes a fire fighting liquid; The magnetic float is located in the cavity and rises with the rise of the liquid level of the fire fighting liquid, or falls with the decline of the liquid level of the fire fighting liquid; The reed switch is fixedly connected to the body, and when the amount of the fire-fighting liquid in the cavity is greater than or equal to a preset value, the magnetic field strength of the magnetic float acting on the reed switch is greater than or equal to the set value. fixed value to realize the conduction of driving the reed switch; when the amount of the fire-fighting liquid in the cavity is less than the preset value, the magnetic field strength of the magnetic float acting on the reed switch is less than the set value value, to achieve actuation of the reed switch off. 9 . The fire suppression device according to claim 8 , further comprising a column disposed in the cavity, and the magnetic float is sleeved on the column. 10. The fire suppression device according to claim 8 or 9, further comprising a controller; The controller is electrically connected to the reed switch, and the controller is used to output a first signal when the reed switch is disconnected, and the first signal is used to represent the fire-fighting liquid in the cavity. amount is less than the preset value. 11. A battery, characterized by comprising a box body and the fire suppression device according to any one of claims 1-10 arranged in the box body. 12. The battery according to claim 11, wherein the fire suppression device includes the controller, and the battery further includes a battery management module arranged in the box; the controller is integrated in the In the battery management module described above. 13. An electrical device, characterized by comprising a casing and the fire suppression device according to any one of claims 1-10 or the battery according to claim 11 or 12 accommodated in the casing.

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