Boiling point detection device and boiling point detection method

Abstract

The invention discloses a boiling point detection device and a boiling point detection method. The boiling point detection device comprises a temperature adjusting box, a sample bearing structure, a pressure monitoring assembly and a pressure adjusting assembly, an accommodating space is arranged in the temperature adjusting box, and a temperature detector is arranged in the accommodating space; the sample bearing structure is arranged in the accommodating space and is used for bearing the detection liquid; the pressure monitoring assembly comprises a detection pipe and a pressure detector, the detection pipe comprises a middle section, a first pipe section and a second pipe section, the first pipe section and the second pipe section are located on the two sides of the middle section, the middle section communicates with the first pipe section and the second pipe section, and the first pipe section and the second pipe section extend in the first direction; the first pipe section is connected with a pressure detector; the second pipe section is connected with a sample bearing structure; the pressure adjusting assembly comprises a vacuum assembly and an air inflation assembly, and the vacuum assembly and the air inflation assembly are both connected to the first pipe section. The boiling point detection device provided by the embodiment of the invention can detect the boiling point of the electrolyte under negative pressure.

Description

Technical Field

[0001] This application relates to the field of boiling point detection technology, specifically to a boiling point detection device and a boiling point detection method. Background Technology

[0002] In related technologies, the boiling point of a liquid changes with pressure; lower pressure results in a lower boiling point. Under vacuum conditions during cell formation, the electrolyte boils and vaporizes, being extracted from the cell, causing excessive electrolyte loss. Insufficient electrolyte filling leads to interface problems.

[0003] Currently, there is no effective method for detecting the boiling point of electrolyte under negative pressure. Summary of the Invention

[0004] In view of the above problems, this application provides a boiling point detection device and a boiling point detection method, which can detect the boiling point of electrolyte under negative pressure.

[0005] In a first aspect, this application provides a boiling point detection device, comprising: a temperature regulating chamber, a sample receiving structure, a pressure monitoring component, and a pressure regulating component. The temperature regulating chamber has a accommodating space, and a temperature detector is disposed within the accommodating space. The sample receiving structure is disposed in the accommodating space to hold the detection liquid. The pressure monitoring component includes a detection tube and a pressure detector. The detection tube includes a middle section and a first tube segment and a second tube segment located on both sides of the middle section. The middle section is connected to the first tube segment and the second tube segment. The first tube segment and the second tube segment extend in a first direction. The first tube segment is connected to the pressure detector, and the second tube segment is connected to the sample receiving structure. The pressure regulating component includes a vacuum component and a gas filling component, both of which are connected to the first tube segment.

[0006] In the technical solution of this application embodiment, the first pipe section is connected to a pressure detector and a pressure regulating component, and the second pipe section is connected to a sample-bearing structure. The sample-bearing structure is kept under negative pressure by the vacuum component of the pressure regulating component. The temperature regulating chamber heats the sample-bearing structure in the containment space, raising the temperature of the detection liquid. The liquid level of the liquid-sealed solution in the first and second pipe sections changes. The liquid level of the liquid-sealed solution in the first pipe section is continuously adjusted by the vacuum component and the gas-filling component of the pressure regulating component to keep the liquid level difference between the first and second pipe sections within a preset range. When the pressure value read by the pressure detector reaches the preset pressure value, and the liquid level difference between the first and second pipe sections is adjusted within the preset difference range, the value of the temperature detector in the temperature regulating chamber is read. This value of the temperature detector is the boiling point of the detection liquid at the preset pressure value.

[0007] Therefore, by using a detection tube and continuously adjusting the liquid level of the liquid-sealed solution in the first pipe section, the pressure value in the second pipe section is indirectly read through a pressure detector, thereby enabling the detection of the boiling point of the liquid under different negative pressures. This boiling point detection device can detect the boiling point of different electrolyte mixtures, thus preventing the electrolyte from boiling and vaporizing during cell vacuuming, preventing significant electrolyte loss during negative pressure evacuation, and overcoming interface problems caused by insufficient electrolyte filling. In some embodiments, the detection tube further includes a sealing plug, a main connecting section, and a first connecting section disposed on one side of the main connecting section, the main connecting section communicating with the first connecting section; the main connecting section is connected to the sample-bearing structure, the first connecting section is connected to the first pipe section, and the sealing plug is movably disposed on the main connecting section to connect or separate the main connecting section from the first connecting section. The sealing plug is movable within the main connecting section, thereby connecting or separating the main connecting section from the first connecting section. This allows the sample-bearing structure connecting the main connecting section to be connected or separated from the first pipe section connecting the first connecting section. When the main connecting section and the first connecting section are connected, the sample-bearing structure is under negative pressure. When the main connecting section and the first connecting section are separated, the pressure of the second pipe section connecting the sample-bearing structure is independent of that of the first pipe section.

[0008] In some embodiments, the main connecting section is provided with an adjustment port, and the sealing plug is movably disposed in the adjustment port. In this embodiment, the sealing plug is movably disposed in the adjustment port of the main connecting section, so that it can extend into the junction of the main connecting section and the first connecting section, thereby connecting or separating the main connecting section and the first connecting section.

[0009] In some embodiments, the detection tube further includes a second connecting section disposed on one side of the main connecting section. The second connecting section is closer to the sample-bearing structure than the first connecting section, and the second connecting section connects to the second pipe section. The sample-bearing structure is connected to the second pipe section through the second connecting section, thereby achieving communication between the sample-bearing structure and the second pipe section.

[0010] In some embodiments, the detection tube further includes a buffer cavity disposed in the first tube segment, located between the intermediate segment and the first connecting segment. By providing a buffer cavity between the intermediate segment and the first connecting segment, the liquid seal solution in the first tube segment is prevented from spraying out due to drastic pressure changes within the sample-bearing structure, and the liquid seal solution in the first tube segment is also prevented from flowing through the first connecting segment and contaminating the detection liquid within the sample-bearing structure.

[0011] In some embodiments, the detection tube is disposed within the accommodating space. Disposing the detection tube within the accommodating space of the temperature-controlled chamber ensures that the detection tube and the sample-bearing structure are in the same environment, thereby enabling more accurate detection of the pressure within the sample-bearing structure.

[0012] In some embodiments, the second pipe segment extends out of the temperature control chamber and connects to the vacuum assembly, the gas filling assembly, and the pressure detector. In this design, the second pipe segment extending out of the temperature control chamber connects to the vacuum assembly, the gas filling assembly, and the pressure detector, thereby placing the vacuum assembly, the gas filling assembly, and the pressure detector outside the containment space, thus preventing the vacuum assembly, the gas filling assembly, and the pressure detector from being affected by temperature changes within the containment space.

[0013] In some embodiments, the pressure monitoring component further includes a liquid level recognition component, which is configured to acquire the liquid levels of the first pipe segment and the second pipe segment. By using the liquid level recognition component to acquire the liquid levels of the first pipe segment and the second pipe segment, it is not necessary to visually inspect the liquid levels of the first pipe segment and the second pipe segment, thus reducing detection errors.

[0014] In some embodiments, both the first pipe segment and the second pipe segment are made of light-transmitting material. By using light-transmitting material for the first and second pipe segments, light can pass through them, allowing the liquid level of the first and second pipe segments to be obtained through their walls.

[0015] In some embodiments, the liquid level recognition component is disposed in the accommodating space, with its camera facing the first and second pipe segments. This allows the liquid level recognition component to directly detect the liquid level in the first and second pipe segments through their walls, eliminating the need for a temperature control chamber and thus reducing detection errors.

[0016] In some embodiments, the pressure regulating assembly further includes a control assembly connected to the vacuum assembly, the inflation assembly, the pressure detector, and the liquid level identification assembly. The control assembly can obtain the liquid levels of the first and second pipe sections through the liquid level identification assembly and the pressure value within the first pipe section through the pressure detector, thereby controlling the vacuum assembly and the inflation assembly to perform inflation and vacuuming operations, thus regulating the liquid level difference between the first and second pipe sections.

[0017] In some embodiments, the temperature regulating chamber includes a chamber body, a heating element, and a cooling element. The chamber body has the accommodating space, and the heating element and the cooling element are installed in the chamber body. The heating element heats the accommodating space of the chamber body, thereby increasing the temperature within the accommodating space; coolant flows in the cooling element to decrease the temperature within the accommodating space, thus achieving temperature regulation within the accommodating space.

[0018] In some embodiments, the boiling point detection device further includes a sample injection assembly, which includes an injection line and an injection valve. The injection valve is located in the injection line, which passes through the temperature control chamber and connects to the sample receiving structure. By using an injection line connected to the sample receiving structure and controlling the injection volume of the detection liquid via the injection valve, and by having the injection line pass through the temperature control chamber, the detection liquid does not need to be placed in the receiving space beforehand, thereby avoiding the influence of temperature changes in the receiving space on the detection liquid before detection.

[0019] Secondly, this application provides a boiling point detection method, employing the boiling point detection device described in the above embodiments, the boiling point detection method comprising the following steps:

[0020] Adjust the liquid level difference between the first pipe section and the second pipe section to be within the preset difference range;

[0021] Under the condition that the pressure in the first pipe section reaches the preset pressure value and the liquid level difference between the first pipe section and the second pipe section is within the preset difference range, the value of the temperature detector of the temperature control box is obtained. The value of the temperature detector is the boiling point of the detected liquid at the preset pressure value.

[0022] In the technical solution of this application embodiment, by adjusting the liquid level difference between the first pipe section and the second pipe section within a preset difference range, the pressure in the first pipe section is made equal to the pressure in the second pipe section. By obtaining the pressure in the first pipe section, the pressure in the second pipe section can be obtained. When the pressure in the first pipe section reaches a preset pressure value, and the liquid level difference between the first and second pipe sections is within the preset difference range, it indicates that the pressure in the second pipe section has also reached the preset pressure value. By obtaining the value from the temperature detector of the temperature regulating chamber, the temperature of the detected liquid in the containment space is obtained, and this temperature is the boiling point of the detected liquid at the preset pressure value.

[0023] In some embodiments, the step of adjusting the liquid level difference between the first pipe section and the second pipe section within a preset difference range includes the following steps: adjusting the liquid level of the first pipe section by inflating or evacuating, thereby controlling the liquid level difference between the first pipe section and the second pipe section within a preset difference range. Adjusting the pressure within the first pipe section by inflating or evacuating, thereby adjusting the liquid level of the first pipe section, and thus ensuring that the liquid level difference between the first pipe section and the second pipe section is within the preset difference range.

[0024] In some embodiments, the step of adjusting the liquid level of the first pipe section by inflating or vacuuming to make the liquid level difference between the first pipe section and the second pipe section within a preset range includes the following steps: inflating the first pipe section when the liquid level of the first pipe section is higher than that of the second pipe section; and vacuuming the first pipe section when the liquid level of the first pipe section is lower than that of the second pipe section. When the liquid level of the first pipe section is higher than that of the second pipe section, the pressure inside the first pipe section is lower than that inside the second pipe section. By inflating the first pipe section, the pressure inside the first pipe section is increased to adjust the liquid level of the first pipe section. When the liquid level of the first pipe section is lower than that of the second pipe section, the pressure inside the first pipe section is greater than that inside the second pipe section. By vacuuming the first pipe section, the pressure inside the first pipe section is reduced to increase the liquid level of the first pipe section.

[0025] In some embodiments, before the step of adjusting the liquid level difference between the first pipe section and the second pipe section to within a preset difference range, the following steps are included: injecting test liquid according to a preset volume or preset weight while the sample-bearing structure is under negative pressure. Negative pressure injection prevents significant loss of test liquid during the negative pressure extraction process, which could affect the test results.

[0026] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0027] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiments below. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0028] Figure 1 This is a schematic diagram of the structure of a boiling point detection device according to some embodiments of this application;

[0029] Figure 2 A flowchart illustrating the boiling point detection method of some embodiments of this application;

[0030] Figure 3 This is a flowchart illustrating a boiling point detection method according to other embodiments of this application.

[0031] The reference numerals in the detailed embodiments are as follows:

[0032] Boiling point detection device 10;

[0033] Temperature control chamber 100, containing space 100a, temperature detector 110;

[0034] 200mm for the support structure;

[0035] First pipe section 311, second pipe section 312, intermediate section 313, pressure detector 320, sealing plug 330, main connecting section 340, first connecting section 341, second connecting section 342, buffer chamber 343, liquid level recognition component 350; pressure regulating component 400, vacuum component 410, air filling component 420;

[0036] Sample introduction component 500. Detailed Implementation

[0037] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0038] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms "comprising" and "having," and any variations thereof, in the specification, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion. In the description of embodiments of this application, technical terms such as "first," "second," etc., are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary or secondary relationship of the indicated technical features. In the description of embodiments of this application, "a plurality of" means two or more, unless otherwise explicitly defined.

[0039] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0040] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0041] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple groups" refers to two or more (including two groups), and "multiple pieces" refers to two or more (including two pieces). In the description of the embodiments of this application, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0042] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0043] In related technologies, within a confined space, the pressure of the gas at which the vaporization and liquefaction of a liquid reach equilibrium at a certain temperature is called the saturated vapor pressure. The temperature at which the saturated vapor pressure of the liquid equals the external pressure is called the boiling point. When the vapor pressure is greater than or equal to atmospheric pressure, bubbles can grow and rise, causing the liquid to boil. The vapor then pushes aside the air and escapes from the space above the liquid. The lower the atmospheric pressure, the lower the temperature required to produce a vapor pressure equal to atmospheric pressure. Therefore, the boiling point of any substance depends on atmospheric pressure. That is, the saturated vapor pressure of the same liquid differs at different temperatures, and the boiling point of the liquid changes with pressure; lower pressure results in a lower boiling point.

[0044] When a battery cell is under vacuum, the reduced ambient pressure lowers the boiling point of the electrolyte, causing it to boil and vaporize, thus being extracted from the cell and resulting in electrolyte loss. Insufficient electrolyte filling within the cell leads to interface problems, such as inadequate wetting of electrode materials and separators, hindering ion transport between the electrolyte and the electrolytic cell, and reducing ion conductivity.

[0045] Currently, the boiling point of liquids is tested using an open-air method, which can only be done by changing the external pressure at different altitudes, making the testing conditions harsh. Furthermore, open-air testing is not suitable for volatile liquids, limiting the types of liquids that can be tested. Electrolytes are typically volatile, making open-air boiling point testing inaccurate.

[0046] Regarding the boiling point of electrolytes, although specific components have corresponding theoretical boiling point values ​​under different pressures, different electrolytes have different components, including different numbers of components, and different proportions of components in the electrolyte also result in different boiling points. Moreover, most electrolytes containing multiple components do not have corresponding theoretical boiling point values.

[0047] Therefore, there is currently no effective means to detect the boiling point of electrolytes under negative pressure.

[0048] Based on the above considerations, in order to achieve electrolyte boiling point detection under negative pressure, a boiling point detection device was designed after in-depth research. A sample-supporting structure connects to a second section of the detection tube, while the first section of the detection tube is connected to a pressure detector and a pressure regulating component. The pressure regulating component reduces the pressure inside the detection tube, thereby creating a negative pressure state within the sample-supporting structure, allowing for boiling point detection of the electrolyte within the sample-supporting structure under negative pressure. In this boiling point detection device, a liquid-sealing solution can be injected into the detection tube. The liquid level of the liquid-sealing solution is located at the first and second sections, thus separating the first and second sections. This makes the internal environment of the sample-supporting structure connected to the second section independent of the internal environment of the second section. This not only achieves a sealed internal environment for the sample-supporting structure but also allows for the determination of the relative internal pressures of the sample-supporting structure and the first section by observing the liquid levels in the first and second sections.

[0049] The sample-bearing structure is housed within the temperature-controlled chamber. Heating increases the temperature of the test liquid carried by the sample-bearing structure, thereby raising the saturated vapor pressure of the test liquid within the sample-bearing structure, which in turn causes a change in the liquid level within the first pipe section connected to the sample-bearing structure. To measure the saturated vapor pressure of the test liquid, the liquid level of the liquid-sealing solution in the first pipe section is continuously adjusted by the vacuum and gas-filling components of the pressure regulating assembly, ensuring that the liquid level difference between the first and second pipe sections remains within a preset range. When the pressure value of the pressure detector connected to the first pipe section reaches the preset pressure value, and the liquid level difference between the first and second pipe sections is adjusted within the preset difference range, it indicates that the saturated vapor pressure of the test liquid has reached the preset pressure value. The value of the temperature detector in the temperature-controlled chamber is then read; this temperature detector value represents the boiling point of the test liquid at that preset pressure value.

[0050] It should be noted that by continuously heating the temperature control chamber, the temperature of the test liquid can be increased, allowing the pressure inside the sample-bearing structure to reach different saturated vapor pressures. This enables continuous testing of the boiling point of the test liquid at different saturated vapor pressures, thereby improving the testing efficiency.

[0051] The boiling point detection device disclosed in this application is used to detect the boiling point of a liquid. The liquid may have a single component or multiple components; the specific liquid may be, but is not limited to, electrolyte, antifreeze, or brake fluid.

[0052] For ease of explanation, the following embodiments use an example of detecting an electrolyte in the liquid as an example. A battery cell assembly is the component in a single battery cell where an electrochemical reaction occurs. The battery cell assembly may also include an electrolyte, a positive electrode, a negative electrode, and a separator. The electrolyte wets the positive electrode, negative electrode, and separator. Typically, the positive and negative electrode are wound or stacked, and a separator is placed between the positive and negative electrode. The portions of the positive and negative electrode containing active material constitute the main body of the battery cell assembly, while the portions of the positive and negative electrode without active material each constitute a tab. During charging and discharging, the positive and negative active materials react with the electrolyte, and the tabs connect to the electrode terminals to form a current loop.

[0053] Please refer to Figure 1 , Figure 1 This is a schematic diagram of the structure of a boiling point detection device 10 provided in some embodiments of this application. This application provides a boiling point detection device 10. The boiling point detection device 10 includes a temperature control chamber 100, a sample receiving structure 200, a pressure monitoring component, and a pressure regulating component 400. The temperature control chamber 100 has a receiving space 100a, and a temperature detector 110 is provided in the receiving space 100a. The sample receiving structure 200 is disposed in the receiving space 100a to hold the detection liquid.

[0054] A pressure monitoring component is disposed in the accommodating space 100a. The pressure monitoring component includes a detection tube and a pressure detector 320. The detection tube includes a middle section 313 and a first tube section 311 and a second tube section 312 located on both sides of the middle section 313. The middle section 313 is connected to the first tube section 311 and the second tube section 312. The first tube section 311 and the second tube section 312 extend in a first direction. The first tube section 311 is connected to the pressure detector 320, and the second tube section 312 is connected to the sample support structure 200. The pressure regulating component 400 includes a vacuum component 410 and an inflation component 420. Both the vacuum component 410 and the inflation component 420 are connected to the first tube section 311.

[0055] As shown in the figure, the Y direction is the first direction.

[0056] Please refer to Figure 1The temperature regulating chamber 100 has an overall box-like structure, which can be a cube, a cuboid, or other regular or irregular shape. The temperature regulating chamber 100 may include a chamber body, within which a accommodating space 100a is provided. This accommodating space 100a has a specific spatial position to accommodate objects. The shape of the accommodating space 100a can be roughly the same as or different from the shape of the chamber body, depending on the specific requirements.

[0057] The temperature within the accommodating space 100a is adjustable and can be controlled and maintained within a set temperature range, thereby allowing for heating or cooling of objects within the accommodating space 100a. The temperature regulating chamber 100 also includes a temperature detector 110, which is used to detect temperature. By placing the temperature detector 110 within the accommodating space 100a, the temperature of the accommodating space 100a is detected, improving the accuracy of temperature detection.

[0058] The temperature detector 110 may include a temperature sensor and a display component connected to the temperature sensor. The temperature sensor is located in the accommodating space 100a, and the display component may be located on the outer wall of the enclosure. The temperature sensor converts the temperature into an electrical signal and outputs it, and then converts the electrical signal into a temperature value for the display component, thereby displaying the temperature value of the accommodating space 100a. The principle by which the temperature sensor detects temperature may include thermoelectric effect, voltage effect, resistance change effect, etc.

[0059] Please continue to refer to Figure 1 The sample-receiving structure 200 can be a container for holding objects, having a holding space to hold the test liquid. The sample-receiving structure 200 may include a flask to prevent splashing of the test liquid or reduce evaporation; the flask may include a round-bottom flask with heat resistance, capable of testing high-boiling-point liquids. Additionally, the round-bottom flask is also pressure-resistant, allowing for use under negative pressure to avoid affecting the test. It is understood that the flask may include a body and a neck connecting to the body. The neck's mouth wall may be frosted for a tight fit with other vessels; to prevent leakage, petroleum jelly may also be applied to the frosted area.

[0060] A pressure monitoring component is used to monitor the pressure of the test solution to identify when a preset pressure value (saturated vapor pressure) is reached within the sample support structure 200, thereby obtaining the target boiling point. This pressure monitoring component includes a detection tube, which can be round or square. The detection tube can also be made of various materials, including glass or metal. In some embodiments, to improve the sealing of the connection, the detection tube is made of glass.

[0061] Please refer to Figure 1The detection tube includes an interconnected intermediate section 313, a first section 311, and a second section 312. The intermediate section 313 is located between the first section 311 and the second section 312, and the first section 311 and the second section 312 face a first direction. Figure 1 The intermediate section 313, the first pipe section 311, and the second pipe section 312 can be integrally formed. The connection between the intermediate section 313 and one of the first pipe section 311 or the second pipe section 312 can be an elbow or a bend. After the liquid sealing solution is injected, the liquid sealing solution fills the intermediate section 313, and its liquid level can remain at the first pipe section 311 and the second pipe section 312 respectively.

[0062] The Y direction can be vertical. The first pipe segment 311 and the second pipe segment 312 can extend upward. The first pipe segment 311 and the second pipe segment 312 can both extend vertically, or they can both be inclined. Alternatively, one of the first pipe segment 311 and the second pipe segment 312 can extend vertically, while the other is inclined.

[0063] The pressure monitoring assembly also includes a pressure detector 320, which is used to detect the pressure of the gas. The pressure detector 320 may include a pressure sensor, which can be of various types, as long as it can detect the pressure inside the detection tube. Please refer to [reference needed]. Figure 1 The pressure detector 320 is connected to the first pipe section 311, thereby detecting the pressure inside the first pipe section 311; the pressure detector 320 can also be connected to a display component, thereby transmitting and displaying the detected pressure value to the display component, and then the pressure value inside the first pipe section 311 can be read through the display component.

[0064] Please refer to Figure 1 One end of the second section 312 of the detection tube is connected to the sample-bearing structure 200, and the second section 312 is in communication with the sample-bearing structure 200, thus placing the second section 312 and the sample-bearing structure 200 under the same pressure environment. After the liquid sealing solution is injected, the liquid sealing solution separates the first section 311 and the second section 312, making the pressure in the first section 311 independent from the pressure in the second section 312. Since the sample-bearing structure 200 is connected to the second section 312, the interior of the sample-bearing structure 200 is isolated from the external environment, keeping the interior of the sample-bearing structure 200 under a sealed condition. Ultimately, this achieves a negative pressure state inside the sample-bearing structure 200, preventing the evaporation of the detection liquid and improving the safety performance of the detection. The liquid sealing solution may include silicone oil or the detection liquid.

[0065] Please refer to Figure 1The pressure regulating assembly 400 includes a vacuum assembly 410 and a gas filling assembly 420. The vacuum assembly 410 is used to create a vacuum, thereby reducing the pressure inside the connected first pipe section 311. The vacuum assembly 410 may include a vacuum valve and a vacuum pump, and the opening degree of the vacuum valve controls the pressure inside the first pipe section 311. The gas filling assembly 420 is used to fill in gas, thereby increasing the pressure inside the connected first pipe section 311. The gas filled in may be air or an inert gas. The gas filling assembly 420 may include a gas filling valve and a gas tank, and the amount of gas filled into the first pipe section 311 is controlled by the gas filling valve.

[0066] The temperature chamber 100 heats the container space 100a, increasing the temperature of the detection liquid within the sample-bearing structure 200, thereby continuously raising the saturated vapor pressure of the detection liquid. Since the second pipe section 312 is connected to the sample-bearing structure 200, the liquid level in the second pipe section 312 changes. To determine whether the saturated vapor pressure has reached the preset pressure value, the vacuum component 410 and the gas filling component 420 are adjusted to regulate the liquid level in the first pipe section 311. The pressure value detected by the pressure detector 320 connected to the first pipe section 311 is read when the liquid level difference between the first pipe section 311 and the second pipe section 312 is within a preset range. When the pressure value of the pressure detector 320 reaches the preset pressure value, it indicates that the saturated vapor pressure of the detection liquid has reached the preset pressure value. The value of the temperature detector 110 is the boiling point of the detection liquid at this preset pressure value.

[0067] Thus, by connecting the pressure detector 320 to the first pipe section 311, the saturated vapor pressure of the test liquid within the sample-bearing structure 200 is indirectly detected, thereby determining the boiling point of the test liquid. Furthermore, by continuously heating the solution in the first pipe section 311 through the temperature control chamber 100, the pressure detector 320 can continuously read the pressure value within the sample-bearing structure 200, thereby enabling the detection of the boiling point of the test liquid under different negative pressures. Optionally, according to some embodiments of this application, please continue to refer to... Figure 1 The detection tube also includes a sealing plug 330, a main connecting section 340, and a first connecting section 341 disposed on one side of the main connecting section 340, wherein the main connecting section 340 and the first connecting section 341 are in communication. The main connecting section 340 is connected to the sample receiving structure 200, and the first connecting section 341 is connected to the first pipe section 311. The sealing plug 330 is movably disposed on the main connecting section 340 to connect or separate the main connecting section 340 and the first connecting section 341.

[0068] The first connecting section 341 is located on one side of the main connecting section 340 and communicates with it. The main connecting section 340 connects to the sample-bearing structure 200, and the first connecting section 341 connects to the first pipe section 311, thereby enabling the connection between the sample-bearing structure 200 and the first pipe section 311. The main connecting section 340 and / or the first connecting section 341 can be made of glass. The main connecting section 340 and the first connecting section 341 can be circular pipes. The main connecting section 340 and the first connecting section 341 can be integrally formed, thereby improving their sealing performance. A sealing plug 330 is provided within the main connecting section 340. This sealing plug 330 is movable to the junction of the main connecting section 340 and the first connecting section 341, thereby separating the sample-bearing structure 200 from the first pipe section 311. The sealing plug 330 can also move away from the junction of the main connecting section 340 and the first connecting section 341, thereby connecting the sample-bearing structure 200 to the first pipe section 311. The sealing plug 330 can be made of various materials, including plastic and other polymer materials. The sealing plug 330 can be rotated to move within the main connecting section 340. To improve the sealing performance of the sealing plug 330, petroleum jelly can be applied to its outer surface.

[0069] The sealing plug 330 is movable within the main connecting section 340, thereby connecting or separating the main connecting section 340 from the first connecting section 341. This allows the sample-bearing structure 200 connecting the main connecting section 340 to be connected or separated from the first pipe section 311 connecting the first connecting section 341. When the main connecting section 340 is connected to the first connecting section 341, the sample-bearing structure 200 is under negative pressure. When the main connecting section 340 is separated from the first connecting section 341, the pressure of the second pipe section 312 connecting the sample-bearing structure 200 is independent from that of the first pipe section 311.

[0070] According to some embodiments of this application, optionally, the main connecting section 340 is provided with an adjustment port, and the sealing plug 330 is movably provided in the adjustment port.

[0071] Please refer to Figure 1One end of the main connecting section 340 is connected to the sample-bearing structure 200, and the other end is provided with an adjustment port. The first connecting section 341 is located at the end of the main connecting section 340 with the adjustment port. The first connecting section 341 can be opened on the side wall of the main connecting section 340, and the adjustment port is offset from the first connecting section 341. The sealing plug 330 exits from the junction of the main connecting section 340 and the first connecting section 341 in a direction away from the sample-bearing structure 200. The sealing plug 330 can be at least partially located inside the main connecting section 340; or the end of the main connecting section 340 can be connected to the first connecting section 341, and the sealing plug 330 completely exits from the junction of the main connecting section 340 and the first connecting section 341 in a direction away from the sample-bearing structure 200. The sealing plug 330 leaves the main connecting section 340. At this time, the sample-bearing structure 200 and the first pipe section 311 are also in communication with the external environment.

[0072] The diameter of the adjustment port can be the same as the diameter of the main connecting section 340. The size of the sealing plug 330 can be set according to the adjustment port and the diameter of the main connecting section 340, as long as it can seal the main connecting section 340. The sealing plug 330 is movably disposed in the adjustment port of the main connecting section 340, so that it can extend into the junction of the main connecting section 340 and the first connecting section 341, thereby connecting or separating the main connecting section 340 and the first connecting section 341.

[0073] According to some embodiments of this application, optionally, please refer to Figure 1 The detection tube also includes a second connecting section 342 located on one side of the main connecting section 340. The second connecting section 342 is closer to the sample-bearing structure 200 than the first connecting section 341. The second connecting section 342 is connected to the second pipe section 312.

[0074] The material, pipe diameter, shape, and size of the second connecting section 342 can be set with reference to the first connecting section 341. The second connecting section 342 can be located on one side of the first connecting section 341. For example, the second connecting section 342 can be located between the first connecting section 341 and the sample-bearing structure 200. Of course, the second connecting section 342 and the first connecting section 341 can also be radially spaced apart from the main connecting section 340. It is understood that in some embodiments, the main connecting section 340, the first connecting section 341, and the second connecting section 342 are integrally formed to improve sealing performance. Furthermore, the main connecting section 340, the first connecting section 341, the second connecting section 342, the intermediate section 313, the first pipe section 311, and the second pipe section 312 can be integrally formed to further improve the sealing performance of the detection tube.

[0075] The second pipe section 312 is indirectly connected to the sample-bearing structure 200 through the second connecting section 342. On the one hand, this realizes the connection between the sample-bearing structure 200 and the second pipe section 312; on the other hand, it eliminates the need to modify the sample-bearing structure 200, simplifying its structure; furthermore, it extends the path from the second pipe section 312 to the sample-bearing structure 200, preventing the liquid seal solution in the second pipe section 312 from falling into the sample-bearing structure 200.

[0076] According to some embodiments of this application, optionally, please refer to Figure 1 The detection tube also includes a buffer chamber 343, which is located in the first pipe section 311, between the intermediate section 313 and the first connecting section 341. The buffer chamber 343 can be formed by an outward bulge in the wall of the first pipe section 311, and it can be spherically shaped. The inner diameter of the buffer chamber 343 is larger than the diameter of the first pipe section 311. By setting the buffer chamber 343 in the first pipe section 311, the boiling point detection is kept stable and smooth. The buffer chamber 343 is located between the intermediate section 313 and the first connecting section 341. Compared to the intermediate section 313, the buffer chamber 343 is closer to the first connecting pipe, thus preventing the liquid seal solution in the first pipe section 311 from entering the buffer chamber 343 due to slight pressure changes, which would affect the liquid level regulation of the first pipe section 311.

[0077] By providing a buffer cavity 343 between the intermediate section 313 and the first connecting section 341, the liquid sealing solution in the first pipe section 311 is prevented from spraying out due to drastic pressure changes within the sample-bearing structure 200. Simultaneously, the liquid sealing solution in the first pipe section 311 is prevented from flowing through the first connecting section 341 and contaminating the detection liquid within the sample-bearing structure 200. Optionally, according to some embodiments of this application, please refer to... Figure 1 The detection tube is located in the accommodating space 100a.

[0078] The detection tube is placed within the accommodating space 100a, and both the detection tube and the sample-bearing structure 200 are affected by temperature changes within the accommodating space 100a. In some embodiments, to facilitate the movement of the sealing plug 330, the sealing plug 330 is located in the main connecting section 340 and passes through the temperature regulating chamber 100, so that the sealing plug 330 can be operated outside the accommodating space 100a to achieve communication or separation between the main connecting section 340 and the first connecting section 341.

[0079] The detection tube is placed in the containment space 100a of the temperature regulating chamber 100 so that the detection tube and the sample receiving structure 200 are in the same environment. This makes the pressure in the first pipe section 311 after adjusting the liquid level closer to the pressure in the sample receiving structure 200, and the pressure in the sample receiving structure 200 is detected more accurately.

[0080] According to some embodiments of this application, optionally, please refer to Figure 1The second pipe section 312 extends out of the temperature control box 100 and is connected to the vacuum assembly 410, the gas filling assembly 420 and the pressure detector 320.

[0081] Since the detection tube is located within the accommodating space 100a, the second section 312 of the detection tube can extend out of the temperature regulating chamber 100 and connect to the vacuum assembly 410, the gas filling assembly 420, and the pressure detector 320. This eliminates the need for the vacuum assembly 410, the gas filling assembly 420, and the pressure detector 320 to be located within the accommodating space 100a, thereby avoiding the impact of temperature changes on the vacuum assembly 410, the gas filling assembly 420, and the pressure detector 320, which would affect their service life and improve the detection accuracy of the pressure detector 320.

[0082] The second pipe section 312 extends out of the temperature control box 100 and connects to the vacuum assembly 410, the gas filling assembly 420 and the pressure detector 320, thereby placing the vacuum assembly 410, the gas filling assembly 420 and the pressure detector 320 outside the accommodating space 100a, thus avoiding the vacuum assembly 410, the gas filling assembly 420 and the pressure detector 320 from being affected by the temperature changes of the accommodating space 100a.

[0083] According to some embodiments of this application, optionally, please refer again to Figure 1 The pressure monitoring component also includes a level identification component 350, which is configured to acquire the level of the first pipe section 311 and the second pipe section 312.

[0084] The liquid level identification component 350 is used to identify the liquid levels in the first pipe section 311 and the second pipe section 312, thereby determining the pressure difference between the first pipe section 311 and the second pipe section 312. This allows for either inflation or vacuuming operations to ensure that the liquid levels in the first pipe section 311 and the second pipe section 312 are within a preset difference range. Various types of liquid level identification components 350 can be used, including capacitive liquid level sensors, ultrasonic liquid level sensors, float switch liquid level sensors, radar liquid level sensors, etc.

[0085] By setting up a liquid level recognition component 350 to obtain the liquid levels of the first pipe section 311 and the second pipe section 312, it is not necessary to visually inspect the liquid levels of the first pipe section 311 and the second pipe section 312 to determine whether the liquid level difference is within the preset difference range, thus reducing detection errors.

[0086] According to some embodiments of this application, optionally, the materials of the first pipe section 311 and the second pipe section 312 both include light-transmitting materials.

[0087] The light-transmitting material includes materials that transmit visible light, and may include polyimide, polyetherimide, or light-transmitting segments made of silicate complex salts. In some embodiments, the first segment 311 and the second segment 312 are made of glass, such as transparent glass or translucent colored glass. It is understood that the intermediate segment 313, the first segment 311, and the second segment 312 may all be made of a light-transmitting material.

[0088] By using light-transmitting materials for the first pipe section 311 and the second pipe section 312, light can pass through the first pipe section 311 and the second pipe section 312, thereby allowing the liquid level of the first pipe section 311 and the second pipe section 312 to be obtained through the pipe walls.

[0089] According to some embodiments of this application, optionally, please refer to Figure 1 The liquid level recognition component 350 is disposed in the accommodating space 100a, and the camera of the liquid level recognition component 350 faces the first pipe section 311 and the second pipe section 312.

[0090] The liquid level recognition component 350 may include a charge-coupled device (CCD) to acquire image information. The camera of the liquid level recognition component 350 faces the first pipe segment 311 and the second pipe segment 312, thereby acquiring the liquid level information of the first pipe segment 311 and the second pipe segment 312, so that the pressure regulating component 400 can adjust the liquid level of the first pipe segment 311. Alternatively, the temperature regulating tank 100 can be light-transmitting, and the liquid level recognition component 350 can be disposed within the temperature regulating tank 100, thereby acquiring the liquid level information of the first pipe segment 311 and the second pipe segment 312 through the tank body and the pipe wall of the first pipe segment 311.

[0091] This application uses a liquid level identification component 350 disposed in the accommodating space 100a. The liquid level identification component 350 can directly obtain the liquid level of the first pipe section 311 and the second pipe section 312 through the pipe walls, thereby eliminating the need to go through the temperature control box 100 and reducing detection errors.

[0092] According to some embodiments of this application, optionally, the pressure regulating assembly 400 further includes a control assembly, which is connected to the vacuum assembly 410, the gas filling assembly 420, the pressure detector 320, and the liquid level recognition assembly 350, respectively. The control assembly can be implemented using a main controller, such as an MCU, DSP (Digital Signal Processor), FPGA (Field Programmable Gate Array), PLC, or SOC (System on Chip).

[0093] The liquid level recognition component 350 transmits the acquired liquid level information of the first pipe section 311 and the second pipe section 312 to the control component. The control component determines whether the liquid level difference between the first pipe section 311 and the second pipe section 312 is within a preset difference range. If it exceeds the preset difference range, the vacuum component 410 or the gas filling component 420 is activated based on the relative height of the first pipe section 311 to the second pipe section 312. The vacuum component 410 is connected to the first pipe section 311. The vacuum component 410 evacuates the first pipe section 311, which reduces the pressure inside the first pipe section 311, thereby increasing the liquid level in the first pipe section 311. The gas filling component 420 is connected to the first pipe section 311. The gas filling component 420 fills the first pipe section 311 with gas, thereby increasing the pressure inside the first pipe section 311 and lowering the liquid level in the first pipe section 311.

[0094] The first pipe section 311 is also connected to a pressure detector 320, which detects the pressure within the first pipe section 311 and transmits the detected pressure value to the control component to determine whether a preset pressure value has been reached. The temperature detector 110 can also be connected to the control component. When the pressure value detected by the pressure detector 320 reaches the preset pressure value, the temperature detector 110 obtains the temperature value within the containment space 100a, thus determining the boiling point of the tested liquid at the preset pressure value. Alternatively, the control component can be connected to a temperature regulating chamber 100 to control the temperature of the containment space 100a.

[0095] The control component can obtain the liquid level of the first pipe section 311 and the second pipe section 312 through the liquid level recognition component 350, obtain the pressure value in the first pipe section 311 through the pressure detector 320, and control the vacuum component 410 and the gas filling component 420 to perform gas filling and vacuuming operations, thereby adjusting the liquid level difference between the first pipe section 311 and the second pipe section 312, and thus automatically and continuously detect the boiling point of the test liquid under different negative pressures.

[0096] According to some embodiments of this application, optionally, the temperature regulating chamber 100 includes a chamber body, a heating pipe and a cooling pipe, the chamber body is provided with an accommodating space 100a, and the heating pipe and the cooling pipe are installed in the chamber body.

[0097] The temperature control chamber 100 has a housing space 100a inside to hold the sample-bearing structure 200. A heating tube can be installed in the chamber. When the heating tube is energized, it generates heat, converting electrical energy into thermal energy. The heat is transferred to the housing space 100a through radiation and convection, thus heating the sample-bearing structure 200 within the housing space 100a.

[0098] Cooling pipes are installed in the enclosure, and coolant flows within them, carrying away heat from the containment space 100a and thus cooling the room. The temperature control chamber 100 may also include a compressor, condenser, evaporator, and expansion valve. The compressor compresses the coolant into high-pressure gas, which is then cooled by the condenser and converted into high-pressure liquid. The high-pressure liquid is depressurized by the expansion valve and enters the evaporator. Due to the reduced pressure, the liquid coolant evaporates and absorbs heat, thereby lowering the internal temperature of the evaporator. The coolant then re-enters the compressor, and the cycle repeats.

[0099] The temperature inside the housing 100a is increased by heating the heating tubes; coolant flows in the cooling tubes to lower the temperature inside the housing 100a, thus achieving temperature regulation inside the housing 100a.

[0100] According to some embodiments of this application, optionally, please refer to Figure 1 The boiling point detection device 10 also includes a sample injection assembly 500, which includes a sample injection pipeline and a sample injection valve. The sample injection valve is located in the sample injection pipeline, which passes through the temperature control box 100 and is connected to the sample receiving structure 200.

[0101] One end of the injection line is connected to the sample-receiving structure 200, and the other end is inserted into the container containing the detection liquid. To prevent gas from entering during injection and affecting the partial pressure of the detection liquid, the injection line is inserted below the liquid surface in the container. Of course, the gas in the injection line can be vented before injection. The injection line can be a flexible tube, which passes through the body of the temperature control chamber 100 and enters the receiving space 100a to connect with the sample-receiving structure 200.

[0102] The injection valve may include a valve body, valve core, and sealing structure. The injection valve is installed in the injection pipeline, and controlling its opening degree controls the flow rate of the detection liquid, thereby controlling the injection volume. The injection valve can be manually controlled, with the opening degree and injection time manually adjusted to inject the detection liquid into the sample receiving structure 200; alternatively, the injection valve can be electrically controlled, connected to a control component that controls the injection according to a preset volume or weight.

[0103] The injection valve can be located either inside or outside the accommodating space 100a. For some embodiments, please refer to... Figure 1 The injection valve is located outside the temperature control box 100, which facilitates the control of the injection valve and also prevents temperature changes from affecting the life of the injection valve, thus extending the service life of the injection valve.

[0104] The sample receiving structure 200 is connected by a sample injection pipeline. The injection volume of the test liquid is controlled by the injection valve. The sample injection pipeline is installed in the temperature control box 100. The test liquid does not need to be placed in the container space 100a in advance, thereby avoiding the influence of temperature changes in the container space 100a on the test liquid before detection.

[0105] Please refer to Figure 2 , Figure 2 This is a flowchart illustrating a boiling point detection method provided in some embodiments of this application. This application provides a boiling point detection method. The boiling point detection method employs the boiling point detection device 10 described in any of the above schemes, and includes the following steps:

[0106] S10: Adjust the liquid level difference between the first pipe section 311 and the second pipe section 312 to be within the preset difference range;

[0107] S20: When the pressure in the first pipe section 311 reaches the preset pressure value and the liquid level difference between the first pipe section 311 and the second pipe section 312 is within the preset difference range, the value of the temperature detector 110 of the temperature regulating box 100 is obtained. The value of the temperature detector 110 is the boiling point of the detected liquid at the preset pressure value.

[0108] As the temperature regulating chamber 100 heats up, the temperature of the liquid being tested inside the sample-bearing structure 200 rises, reaching its saturated vapor pressure. Since the saturated vapor pressure of a substance varies at different temperatures, the saturated vapor pressure of the liquid being tested inside the sample-bearing structure 200 also continuously increases, changing the pressure inside the sample-bearing structure 200 and causing a change in the liquid level in the second pipe section 312 connected to the sample-bearing structure 200.

[0109] To obtain the saturated vapor pressure of the detection liquid, in step S10, the liquid level of the first pipe section 311 is continuously adjusted to reduce the difference between the liquid levels of the first pipe section 311 and the second pipe section 312, ensuring that the liquid level difference between the first pipe section 311 and the second pipe section 312 is within a preset range. This allows the pressure in the first pipe to be detected by the pressure detector 320 connected to the first pipe section 311. It is understood that this preset difference range can be 3-5 cm, for example, 3 cm, 4 cm, or 5 cm. Taking a preset difference range of 3 cm as an example, adjusting the liquid level difference between the first pipe section 311 and the second pipe section 312 to within 3 cm improves the accuracy of the detection.

[0110] Of course, the liquid level in the first pipe section 311 can be level with the liquid level in the second pipe section 312, so as to more accurately detect the saturated vapor pressure of the detection liquid, determine whether the saturated vapor pressure of the detection liquid has reached the preset pressure, and thus accurately obtain the corresponding temperature boiling point, reducing measurement error.

[0111] In order to determine that the saturated vapor pressure of the test liquid has reached the preset pressure value, in step S20, the liquid level difference between the first pipe section 311 and the second pipe section 312 is adjusted to the range of the preset difference value, and the pressure in the first pipe section 311 reaches the preset pressure value, indicating that the pressure in the first pipe section 311 is the same as the pressure in the sample-bearing structure 200 connecting the second pipe section 312, and the saturated vapor pressure of the test liquid has reached the preset pressure value. At this time, the temperature of the test liquid is the boiling point of the preset pressure.

[0112] Temperature detector 110 of temperature control chamber 100 detects the temperature of containment space 100a, thereby obtaining the temperature value of the detected liquid, and further obtaining the boiling point of the detected liquid under a preset pressure value. This preset pressure value can be from -90 kPa to -20 kPa, for example, -90 kPa, -85 kPa, -80 kPa, -75 kPa, -60 kPa, -50 kPa, -40 kPa, -30 kPa, -20 kPa, etc.

[0113] By adjusting the liquid level difference between the first pipe section 311 and the second pipe section 312 to a preset range, the pressure in the first pipe section 311 becomes equal to the pressure in the second pipe section 312. The pressure in the second pipe section 312 can be obtained by acquiring the pressure in the first pipe section 311. When the pressure in the first pipe section 311 reaches the preset pressure value, and the liquid level difference between the first pipe section 311 and the second pipe section 312 is within the preset range, it indicates that the pressure in the second pipe section 312 has also reached the preset pressure value. By acquiring the value from the temperature detector 110 of the temperature control chamber 100, the temperature of the detected liquid in the containment space 100a is obtained. This temperature is the boiling point of the detected liquid at the preset pressure value.

[0114] According to some embodiments of this application, optionally, the step of adjusting the liquid level difference between the first pipe section 311 and the second pipe section 312 to be within a preset difference range in S10 includes the following steps:

[0115] S11: Adjust the liquid level of the first pipe section 311 by inflating or vacuuming to control the liquid level difference between the first pipe section 311 and the second pipe section 312 within the range of a preset difference value.

[0116] In step S11, the first pipe section 311 is connected to an inflation component 420 and a vacuum component 410. The inflation or vacuuming operation is used to adjust the pressure inside the first pipe section 311, thereby adjusting the liquid level in the first pipe section 311 and controlling the liquid level difference between the first pipe section 311 and the second pipe section 312 within a preset range.

[0117] The pressure inside the first pipe section 311 is adjusted by inflating or evacuating, thereby adjusting the liquid level in the first pipe section 311 so that the liquid level difference between the first pipe section 311 and the second pipe section 312 is within a preset range.

[0118] According to some embodiments of this application, optionally, in step S11, adjusting the liquid level of the first pipe section 311 by inflating or vacuuming to make the liquid level difference between the first pipe section 311 and the second pipe section 312 within a preset difference range includes the following steps:

[0119] When the liquid level in the first pipe section 311 is higher than the liquid level in the second pipe section 312, the first pipe section 311 is purged with air; when the liquid level in the first pipe section 311 is lower than the liquid level in the second pipe section 312, the first pipe section 311 is evacuated. Specifically, when the liquid level in the first pipe section 311 is higher than the liquid level in the second pipe section 312, air is purged into the first pipe section 311 to keep the liquid level difference between the first pipe section 311 and the second pipe section 312 within a preset range; when the liquid level in the first pipe section 311 is lower than the liquid level in the second pipe section 312, the first pipe section 311 is evacuated to adjust the liquid level in the first pipe section 311 so that the liquid level difference between the first pipe section 311 and the second pipe section 312 is within a preset range.

[0120] The vacuuming can be performed using a vacuum assembly 410, which may include a vacuum pump, a vacuum valve, and a vacuum pipeline. The vacuum valve is located in the vacuum pipeline. By starting the vacuum pump and opening the vacuum valve, the first pipeline connected to the vacuum pipeline is evacuated.

[0121] The inflation operation can be performed using an inflation assembly 420, which includes an air tank, an inflation valve, and an inflation pipeline. Similarly, inflation is performed by opening the inflation valve into the first pipeline connected to the inflation pipeline. The gas in the air tank can be air or other gases, as long as it does not affect the pressure in the first pipe section 311 and the second pipe section 312. Alternatively, the inflation assembly 420 may include a connecting valve located in the first pipe section 311. The opening of the connecting valve allows outside air to enter the first pipe section 311, thereby increasing the pressure within the first pipeline.

[0122] The liquid level in the first pipe section 311 is higher than the liquid level in the second pipe section 312, and the pressure in the first pipe section 311 is lower than the pressure in the second pipe section 312. By inflating the first pipe section 311 with air, the pressure in the first pipe section 311 is increased to regulate the liquid level in the first pipe section 311. The liquid level in the first pipe section 311 is lower than the liquid level in the second pipe section 312, and the pressure in the first pipe section 311 is greater than the pressure in the second pipe section 312. By evacuating the first pipe section 311, the pressure in the first pipe section 311 is reduced to increase the liquid level in the first pipe section 311.

[0123] According to some embodiments of this application, optionally, before step S10 of adjusting the liquid level difference between the first pipe section 311 and the second pipe section 312 to be within a preset difference range, the following steps are included:

[0124] S30: With the sample holder 200 under negative pressure, inject the detection liquid according to a preset volume or preset weight. In step S30, the sample holder 200 is first evacuated to create a negative pressure state. This negative pressure drives the detection liquid into the sample holder 200, completing the injection operation. This eliminates the need to inject the detection liquid before evacuating, avoiding detection liquid loss. The preset volume can be 100-150 mL.

[0125] By using negative pressure injection, we can prevent the detection liquid from being lost in large quantities during the negative pressure extraction process, which would affect the test results.

[0126] According to some embodiments of this application, optionally, before step S10 of adjusting the liquid level difference between the first pipe section 311 and the second pipe section 312 to be within a preset difference range, the following steps are included:

[0127] A liquid sealing solution is injected into the detection tube so that the liquid level of the liquid sealing solution is located at the first section 311 and the second section 312 of the detection tube, respectively.

[0128] A liquid sealing solution is injected into the detection tube, with the liquid level positioned at the first section 311 and the second section 312 of the detection tube. This separates the pressure in the second section 312 from the pressure in the first section 311 and seals the sample-bearing structure 200 connecting the second section 312. The liquid sealing solution can be silicone oil, which possesses good chemical stability and compressibility to facilitate pressure detection. Alternatively, the liquid sealing solution can be the detection liquid itself, thus avoiding the influence of the vapor pressure of other substances and allowing for more accurate detection of the saturated vapor pressure of the detection liquid.

[0129] After injecting the liquid sealing solution, degas the solution to remove bubbles and prevent them from affecting the partial pressure of the detection liquid. The detection tube containing the liquid sealing solution can be placed in an oven for heating, such as at 80℃ for 3-4 hours, to degas the solution.

[0130] After degassing the liquid-sealed solution, the detection tube is connected to the sample-supporting structure 200 and placed in the temperature-controlled chamber 100. A freezing operation is then performed to lower the temperature of the containment space 100a. This lowers the temperature of the containment space 100a to -20°C, which serves two purposes: firstly, it prepares the liquid for subsequent heating to prevent rapid boiling under negative pressure; secondly, it facilitates subsequent degassing of the liquid by briefly heating it, preventing excessive loss of the detection liquid.

[0131] A vacuum can be created after freezing, or during freezing, thereby lowering the temperature and creating a negative pressure environment within the sample-bearing structure 200. The first connecting section 341 is connected to the first pipe section 311, and the main connecting section 340 is connected to the sample-bearing structure 200. The vacuum assembly 410 connected to the first pipe section 311 can be used to reduce the pressure within the sample-bearing structure 200, creating a negative pressure environment. Before heating the sample-bearing structure 200, the sealing plug 330 can be moved to the junction of the main connecting section 340 and the first connecting section 341, separating the sample-bearing structure 200 from the first pipe section 311.

[0132] According to some embodiments of this application, optionally, before step S10 of adjusting the liquid level difference between the first pipe section 311 and the second pipe section 312 to be within a preset difference range, the following steps are included:

[0133] The temperature regulating chamber 100 is heated at a preset speed to raise the temperature of the detection liquid; the liquid level of the first pipe section 311 and the liquid level of the second pipe section 312 are monitored and compared.

[0134] In order to obtain the boiling point under different negative pressures, the sample holder 200 is heated by the temperature regulating chamber 100, and the temperature of the detected liquid rises, thereby reaching the saturated vapor pressure at different temperatures, and thus obtaining the boiling point corresponding to the detected liquid.

[0135] Monitor the liquid level in the first pipe section 311 and the liquid level in the second pipe section 312, and compare the liquid level in the first pipe section 311 and the liquid level in the second pipe section 312. If the difference between the two liquid levels is large, it means that the pressure in the first pipe section 311 is significantly different from the pressure in the second pipe section 312. If the difference between the two liquid levels exceeds the preset difference range, it is necessary to adjust the pressure in the first pipe section 311 to prevent the liquid seal solution from being squeezed out of the first pipe section 311 by the second pipe section 312 with higher pressure.

[0136] The liquid level in the first tube section 311 is adjusted by either inflation or vacuuming to keep the level difference between the first tube section 311 and the second tube section 312 within a preset range. Meanwhile, the temperature control chamber 100 is heating, continuously changing the saturated vapor pressure of the detected liquid. The liquid level in the second tube section 312 also changes accordingly. The liquid level in the first tube section 311 is then adjusted to keep the level difference within the preset range. This process is repeated, allowing for continuous detection of the boiling point at different preset pressure values.

[0137] According to some embodiments of this application, please refer to Figure 1This application provides a boiling point detection device 10, including a temperature control chamber 100, a sample receiving structure 200, a pressure monitoring component, a pressure regulating component 400, and a sample injection component 500. The sample receiving structure 200 is used to hold the detection liquid and is disposed within the accommodating space 100a of the temperature control chamber 100. The temperature control chamber 100 is also equipped with a temperature detector 110 for detecting the temperature of the detection liquid. The sample injection component 500 includes a sample injection line and a sample injection valve disposed on the sample injection line. The sample injection line is connected to the sample receiving structure 200, thereby injecting the detection liquid into the sample receiving structure 200.

[0138] The pressure monitoring assembly includes a detection tube disposed in the accommodating space 100a. The detection tube includes an interconnected intermediate section 313, a first pipe section 311, a second pipe section 312, a main connecting section 340, a first connecting section 341, and a second connecting section 342. The first pipe section 311 and the second pipe section 312 are located between the intermediate section 313, and the first pipe section and the second pipe section 312 extend toward a first direction. The first pipe section 311 and the second pipe section 312 are both disposed to obtain the liquid level of the first pipe section and the second pipe section 312. The first connecting section 341 and the second connecting section 342 are both located on one side of the main connecting section 340. The end of the first connecting section 341 facing away from the main connecting section 340 is connected to the first pipe section 311, and the end of the second connecting section 342 facing away from the main connecting section 340 is connected to the second pipe section 312. One end of the main connecting section 340 is connected to the sample-bearing structure 200, and the second connecting section 342 is located between the sample-bearing structure 200 and the first connecting section 341. The other end of the main connecting section 340 extends out of the temperature regulating box 100 and is provided with a sealing plug 330. The sealing plug 330 can move within the main connecting section 340 to the junction of the main connecting section 340 and the first connecting section 341, thereby allowing the main connecting section 340 to communicate with or be separated from the first connecting section 341.

[0139] The first pipe section 311 extends through the temperature regulating chamber 100. The pressure monitoring assembly also includes a pressure detector 320, which is connected to the portion of the first pipe section 311 that extends out of the temperature regulating chamber 100 and is used to detect the pressure inside the first pipe. The portion of the first pipe section 311 that extends out of the temperature regulating chamber 100 is also connected to the vacuum component 410 and the gas filling component 420 of the pressure regulating assembly 400, thereby regulating the pressure inside the first pipe. A buffer chamber 343 is also provided inside the first pipe section 311. The buffer chamber 343 is located between the first connecting section 341 and the intermediate section 313 and is situated within the accommodating space 100a.

[0140] The pressure monitoring component also includes a liquid level recognition component 350 disposed in the accommodating space 100a, wherein the camera of the liquid level recognition component 350 is directed toward the first pipe section 311 and the second pipe section 312 to obtain liquid level information of the first pipe section 311 and the second pipe section 312.

[0141] According to some embodiments of this application, please refer to Figures 2 to 3 This application provides a boiling point detection method using the boiling point detection device 10 described above. The boiling point detection method includes the following steps:

[0142] A liquid sealing solution is injected into the detection tube so that the liquid level of the liquid sealing solution is located at the first section 311 and the second section 312 of the detection tube, respectively.

[0143] Degas the liquid sealing solution by placing the detection tube containing the liquid sealing solution at 80℃ for 3-4 hours.

[0144] The main connecting section 340 of the detection tube is connected to the sample receiving structure 200 to perform a freezing operation, reducing the temperature of the containing space 100a of the temperature regulating chamber 100 to -20°C.

[0145] The vacuum assembly 410 connected to the first pipeline is evacuated, so that the sample-bearing structure 200 is under negative pressure and the pressure inside the sample-bearing structure 200 is -20KPa.

[0146] With the sample-bearing structure 200 under negative pressure, inject 100 mL of pre-frozen test liquid;

[0147] The temperature control chamber briefly heats up to 100°C to degas the test liquid.

[0148] The temperature regulating chamber 100 is heated to raise the temperature of the detection liquid.

[0149] Monitor the liquid level of the first pipe section 311 and the liquid level of the second pipe section 312, and compare the liquid level of the first pipe section 311 and the liquid level of the second pipe section 312.

[0150] When the liquid level in the first pipe section 311 is higher than the liquid level in the second pipe section 312, the first pipe section 311 is purged with air so that the liquid level difference between the first pipe section 311 and the second pipe section 312 is within a preset range; when the liquid level in the first pipe section 311 is lower than the liquid level in the second pipe section 312, the first pipe section 311 is evacuated so that the liquid level difference between the first pipe section 311 and the second pipe section 312 is within a preset range.

[0151] When the pressure in the first pipe section 311 reaches the preset pressure value and the liquid level difference between the first pipe section 311 and the second pipe section 312 is within the preset difference range, the value of the temperature detector 110 of the temperature regulating box 100 is obtained. The value of the temperature detector 110 is the boiling point of the detected liquid at the preset pressure value.

[0152] Example 1

[0153] Using the boiling point detection device 10 and boiling point detection method described above, the boiling point of ethyl methyl carbonate (EMC) under normal pressure and the boiling point of a mixture A (mass fraction: 83.2% ethyl acetate + 7.8% water + 9.0% ethanol) under -90 kPa negative pressure were tested. The test values ​​were compared with the boiling point standard values, and the results are shown in Table 1.

[0154] Table 1 Test Results List

[0155] Detecting liquids Preset pressure value Theoretical value Test value Ethyl methyl carbonate (EMC) 101 kPa 107℃ 108.5℃ Mixture A -90KPa 17℃ 18.0℃

[0156] In Table 1, the boiling point of a single substance tested under normal EMC pressure (101 kPa) is 108.5 °C, close to its theoretical value of 107 °C; the boiling point of mixture A under negative pressure (-90 kPa) is 18.0 °C, also close to its theoretical value. This demonstrates that the boiling point detection device 10 and the boiling point detection method can accurately test the boiling points of single solvents and mixed solvents under both normal and negative pressure.

[0157] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A boiling point detection device, characterized by, The application relates to a boiling point detection device. The device comprises a temperature adjusting box, a sample receiving structure, a pressure monitoring assembly and a pressure adjusting assembly. The temperature adjusting box is internally provided with a containing space, and the containing space is internally provided with a temperature detector. The sample receiving structure is arranged in the containing space to receive a detection liquid. The pressure monitoring assembly comprises a detection tube and a pressure detector.

2. The boiling point detection apparatus of claim 1, wherein The detection tube comprises a middle section and first and second tube sections arranged on both sides of the middle section.

3. The boiling point detection apparatus of claim 2, wherein The first and second tube sections extend towards a first direction.

4. The boiling point detection apparatus of claim 2, wherein The first tube section is connected with the pressure detector, and the second tube section is connected with the sample receiving structure.

5. The battery cell of claim 2, wherein the cathode comprises a lithium metal oxide. The pressure adjusting assembly comprises a vacuum assembly and an air charging assembly.

6. The boiling point detection apparatus of any one of claims 1 to 5, wherein Both the vacuum assembly and the air charging assembly are connected with the first tube section.

7. The boiling point detection apparatus of claim 6, wherein The detection tube further comprises a sealing plug, a main connecting section and a first connecting section arranged on one side of the main connecting section.

8. The boiling point detection apparatus of any one of claims 1 to 5, wherein The main connecting section is in communication with the first connecting section.

9. The boiling point detection apparatus of claim 8, wherein, The main connecting section is connected with the sample receiving structure, and the first connecting section is connected with the first tube section.

10. The boiling point detection apparatus of claim 9, wherein The sealing plug is movably arranged in the main connecting section to communicate or isolate the main connecting section and the first connecting section.

11. The boiling point detection apparatus of claim 8, wherein The main connecting section is provided with an adjusting opening, and the sealing plug is movably arranged in the adjusting opening.

12. The boiling point detection apparatus of any one of claims 1 to 5, wherein The detection tube further comprises a second connecting section arranged on one side of the main connecting section.

13. The boiling point detection apparatus of any one of claims 1 to 5, wherein The second connecting section is closer to the sample receiving structure than the first connecting section.

14. A boiling point detection method using the boiling point detection apparatus according to any one of claims 1 to 13, characterized by, The second connecting section is connected with the second tube section. The detection tube further comprises a buffer cavity arranged in the first tube section. The buffer cavity is located between the middle section and the first connecting section. The detection tube is arranged in the containing space. The second tube section penetrates through the temperature adjusting box and is connected with the vacuum assembly, the air charging assembly and the pressure detector. The pressure monitoring assembly further comprises a liquid level identification assembly arranged to obtain the liquid levels of the first and second tube sections. The materials of the first and second tube sections both comprise light-transmitting materials. The liquid level identification assembly is arranged in the containing space, and a camera of the liquid level identification assembly faces the first and second tube sections. The pressure adjusting assembly further comprises a control assembly connected with the vacuum assembly, the air charging assembly, the pressure detector and the liquid level identification assembly. The temperature adjusting box comprises a box body, a heating pipe and a cooling pipe. The box body is provided with the containing space, and the heating pipe and the cooling pipe are arranged in the box body. The boiling point detection device further comprises a sample feeding assembly. The sample feeding assembly comprises a sample feeding pipeline and a sample feeding valve. The sample feeding valve is arranged in the sample feeding pipeline. The sample feeding pipeline penetrates through the temperature adjusting box and is connected with the sample receiving structure. The method comprises the following steps: Adjusting the liquid level difference between the first and second tube sections to be within a preset difference range. When the pressure in the first tube section reaches a preset pressure value and the liquid level difference between the first and second tube sections is within the preset difference range, obtaining the value of the temperature detector of the temperature adjusting box. The value of the temperature detector is the boiling point of the detection liquid under the preset pressure value.

15. The boiling point detection method of claim 14, wherein, In the step of adjusting the liquid level difference between the first pipe section and the second pipe section within the preset difference range, the method comprises the following steps: The liquid level of the first pipe section is adjusted by inflation or vacuuming, so that the liquid level difference between the first pipe section and the second pipe section is within the preset difference range.

16. The boiling point detection method of claim 15, wherein, In the step of adjusting the liquid level of the first pipe section by inflation or vacuuming, so that the liquid level difference between the first pipe section and the second pipe section is within the preset difference range, the method comprises the following steps: In the case that the liquid level of the first pipe section is higher than that of the second pipe section, the first pipe section is inflated; In the case that the liquid level of the first pipe section is lower than that of the second pipe section, the first pipe section is vacuumed.

17. The boiling point detection method according to any one of claims 14 to 16, wherein Before the step of adjusting the liquid level difference between the first pipe section and the second pipe section within the preset difference range, the method comprises the following steps: The detection liquid is injected in a preset volume or a preset weight under the condition that the sample receiving structure is in a negative pressure state.

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