CN118625159A - Solid-state battery detection device and detection method, battery production equipment - Google Patents

Abstract

The application provides a solid-state battery detection device, a detection method and battery production equipment, and belongs to the technical field of batteries. The solid-state battery detection device includes: a first portion having a reference chamber therein for loading a test gas; a second portion comprising: the first sub-part is provided with a plurality of accommodating grooves, and the accommodating grooves are provided with top openings; the second sub-part is arranged on the first sub-part and covers the top opening of the accommodating groove so as to form an accommodating cavity with the accommodating groove, and the accommodating cavity is used for accommodating a sample to be tested; the solid-state battery detection device further includes: and the communication part is used for communicating the accommodating cavity and the reference cavity so that the test gas in the reference cavity is conveyed to the corresponding accommodating cavity through the communication part. The solid-state battery detection device provided by the embodiment of the application can improve the reliability of the detection result of the sample to be detected.

Description

Solid-state battery detection device and detection method, battery production equipment

Technical Field

The present application relates to the field of battery technology, and in particular to a solid-state battery detection device and detection method, and battery production equipment.

Background Art

Energy conservation and emission reduction are the key to the sustainable development of the automobile industry. Electric vehicles have become an important part of the sustainable development of the automobile industry due to their advantages in energy conservation and environmental protection. For electric vehicles, battery technology is an important factor in their development.

A solid-state battery is a battery that uses solid electrodes and solid electrolytes. The solid electrolyte is solid, and the density of the solid electrolyte can bring more charged ions together, conduct greater current, and increase battery capacity. The density of the solid-state battery is crucial to the performance of the solid-state battery. Therefore, the densification performance of the solid-state battery needs to be tested to evaluate the performance of the solid-state battery.

How to improve the reliability of solid-state battery testing is an urgent problem to be solved

Summary of the invention

The present application aims to solve at least one of the technical problems existing in the background technology. To this end, one purpose of the present application is to provide a solid-state battery detection device and detection method, and battery production equipment to improve the reliability of the detection results of the solid-state battery detection device on the sample to be tested.

An embodiment of the first aspect of the present application provides a solid-state battery detection device, which includes: a first part, the first part has a reference cavity, and the reference cavity is used to load a test gas; a second part, the second part has a plurality of accommodating cavities, including: a first sub-section, the first sub-section has a plurality of accommodating grooves, and the accommodating grooves have a top opening; a second sub-section, which is arranged on the first sub-section and covers the top opening of the accommodating groove to enclose a accommodating cavity with the accommodating groove, and the accommodating cavity is used to accommodate a sample to be tested; the solid-state battery detection device also includes: a connecting portion, which is used to connect the accommodating cavity with the reference cavity, so that the test gas in the reference cavity is transported to the corresponding accommodating cavity through the connecting portion.

In the technical solution of the embodiment of the present application, the first sub-section has a plurality of accommodating grooves forming an accommodating cavity, and different samples to be tested can be placed in the plurality of accommodating cavities. The connecting portion connects the accommodating cavity with the reference cavity, so that the test gas in the reference cavity is transported to the corresponding accommodating cavity through the connecting portion, so as to test the samples to be tested in different accommodating cavities respectively. In this way, multiple samples to be tested can be loaded at the same time, and during the test process, there is no need to change the sample, so as to avoid the change of the test environment caused by the sample change operation. In addition, the plurality of accommodating grooves are located in the same first sub-section, so that the test environment in which the plurality of accommodating grooves are located is consistent, further ensuring the consistency of the test environment in which the plurality of samples to be tested are located, reducing the test error of the different test environments on the samples to be tested, and can greatly improve the accuracy and reliability of the test results.

In some embodiments, the connecting part includes: a first connecting part, the first end of which is connected to the reference cavity; and a plurality of second connecting parts, the plurality of second connecting parts being connected to the plurality of accommodating cavities in a one-to-one correspondence, wherein one end of the second connecting part is connected to the accommodating cavity, and the other end is connected to the second end of the first connecting part. In this way, the test gas can be respectively introduced into the corresponding accommodating cavity through the plurality of second connecting parts, so that the plurality of samples to be tested can be tested independently, and the test results do not interfere with each other, thereby improving the accuracy of the test results of each sample to be tested. In addition, by connecting the plurality of second connecting parts and the reference cavity through a first connecting part, the connection between the first connecting part and the second part can be greatly simplified, thereby simplifying the structure of the entire detection device.

In some embodiments, the connecting portion includes: a plurality of sub-connecting portions, each of which is connected to a containing cavity and a reference cavity. By connecting the reference cavity and different containing cavities respectively through different sub-connecting portions, crosstalk does not occur between the test gases entering different containing cavities, thereby improving the independence of independent testing of multiple samples to be tested and improving the accuracy of the test results.

In some embodiments, the connecting portion includes: a plurality of cut-off pieces, the plurality of cut-off pieces correspond to the plurality of accommodating chambers one by one, and the cut-off pieces are used to cut off the test gas from passing into the accommodating chamber via the connecting portion. In this way, the cut-off piece can cut off the test gas from passing into the accommodating chamber that does not need to be tested, so that the plurality of accommodating chambers and the reference chamber are connected in sequence, thereby making the tests of the plurality of samples to be tested not affect each other, and further improving the accuracy of the test results.

In some embodiments, the second part further includes: a sealing member, located between the first sub-part and the second sub-part, for sealing the top opening of the accommodating groove. The sealing member seals the top opening, thereby ensuring the sealing of the accommodating cavity to a certain extent, and improving the accuracy and reliability of the test results.

In some embodiments, the first sub-unit includes: a plurality of accommodating structures, each of which has an accommodating groove formed therein; an annular groove, which is arranged around the periphery of the accommodating structure; a sealing member including: a top cover; an extension portion, which is arranged around the periphery of the top cover and connected to the top cover, the extension portion extends into the annular groove, and the top cover closes the top opening of the accommodating groove. The extension portion extends into the annular groove to fix the position of the top cover, so that the top cover stably seals the top opening of the accommodating groove to maintain good sealing of the accommodating cavity, and the annular groove surrounds the periphery of the accommodating structure, so that the extension portion does not occupy the volume of the accommodating cavity. When the test result of the sample to be tested is obtained based on the volume of the accommodating cavity and the volume of the test gas located in the accommodating cavity, the volume of the accommodating cavity used in the actual test process is consistent with the actual volume of the accommodating cavity, which is conducive to improving the accuracy of the test result.

In some embodiments, the extension is threadedly connected to the inner surface of the first sub-section for forming an annular groove. Through the threaded connection, on the one hand, the extension can be fixed in the annular groove, thereby improving the stability of the top cover located at the top opening of the accommodating groove, and on the other hand, the sealing between the extension and the inner surface for forming the annular groove can be improved, thereby reducing the risk of test gas escaping from the gap between the extension and the annular groove, further improving the accuracy and reliability of the test results.

In some embodiments, the connecting portion is connected to the other end of the receiving groove opposite to the top opening. Compared with the connecting portion connecting to the side wall of the receiving groove, it can avoid the problem of the connecting portion passing through multiple receiving grooves to connect the receiving grooves respectively to a certain extent, and simplify the routing method of the connecting portion.

An embodiment of the second aspect of the present application provides a battery production device, which includes the solid-state battery detection device in the above embodiment.

The third aspect of the present application provides a solid-state battery detection method, which is applied to the solid-state battery detection device of the above embodiment, and the method includes: introducing a test gas into the reference cavity of the first part; placing a plurality of samples to be tested in a plurality of accommodating grooves of the first sub-part one by one, and making the second sub-part cover the top opening of the accommodating groove, so that the samples to be tested are located in the accommodating cavity; selecting a plurality of accommodating cavities in sequence, and connecting the selected accommodating cavity with the reference cavity, so that the test gas in the reference cavity is delivered to the selected accommodating cavity; testing the samples to be tested in the selected accommodating cavity. Since a plurality of accommodating cavities are provided in the second part, it is possible to simultaneously load a plurality of samples to be tested, and to perform tests in sequence, eliminating the step of changing samples, and improving the efficiency of testing a plurality of samples to be tested. At the same time, since the step of changing samples is omitted, the change of the test environment of the accommodating cavity caused by the sample changing process can be reduced, the consistency of the test environment of a plurality of samples to be tested is ensured, and the test error of the different test environments on the samples to be tested is reduced, which can greatly improve the accuracy and reliability of the test results of the samples to be tested.

In some embodiments, selecting a plurality of accommodating chambers in sequence and connecting the selected accommodating chambers with the reference chamber includes: selecting a target accommodating chamber; connecting the reference chamber with the target accommodating chamber, and cutting off the connection between the remaining accommodating chambers and the reference chamber. In this way, the samples to be tested can be tested one by one, and during the process of testing the current sample to be tested, the test gas will not enter other accommodating chambers, which is conducive to quantifying the test gas in the accommodating chamber being tested, thereby improving the accuracy of the test results of the sample to be tested.

In some embodiments, testing the sample to be tested in the selected accommodating cavity includes: obtaining the true volume of the sample to be tested, which is the volume of the sample to be tested minus the internal pores. By obtaining the true volume of the sample to be tested, the error caused by the pores in the sample to be tested in characterizing the densification degree of the sample to be tested can be reduced, thereby accurately characterizing the densification degree of the sample to be tested.

In some embodiments, obtaining the true volume of the sample to be tested includes: obtaining the first volume of the selected accommodating cavity; obtaining the second volume of the test gas in the selected accommodating cavity; and obtaining the true volume based on the difference between the first volume and the second volume. Since the test gas can fill the entire accommodating cavity and enter the pores inside the sample to be tested, the remaining volume after subtracting the second volume from the first volume is the true volume of the sample to be tested based on the principle of gas displacement, which can eliminate the influence of the pores inside the sample to be tested on the test results, so that the obtained true volume is close to the true value or consistent with the true value.

In some embodiments, the method for obtaining the second volume includes: obtaining the total volume of the test gas in the reference chamber and the selected containing chamber after the reference chamber and the selected containing chamber are connected, as the third volume; obtaining the fourth volume of the reference chamber; and obtaining the second volume based on the difference between the third volume and the fourth volume. After the reference chamber and the selected containing chamber are connected, the test gas only flows in the reference chamber and the selected containing chamber, and the test gas fills the entire reference chamber. The volume of the reference chamber is the volume of the test gas in the reference chamber. Therefore, the second volume of the test gas in the containing chamber can be obtained by subtracting the volume of the reference chamber from the total volume of the test gas. In this way, the second volume of the test gas can be calculated quickly and accurately.

In some embodiments, during the period when the selected accommodating chamber is connected to the reference chamber, the test gas is continuously introduced into the reference chamber, so that the reference chamber is always filled with the test gas, so that the volume of the reference chamber can accurately represent the volume of the test gas in the reference chamber, and thus the calculated value of the second volume is more accurate.

In some embodiments, the method for obtaining the third volume includes: obtaining a first pressure before the reference chamber is connected to the selected accommodating chamber and when the reference chamber is filled with the test gas; obtaining a second pressure of the reference chamber after the reference chamber is connected to the selected accommodating chamber; and obtaining the third volume based on the first pressure, the second pressure, and the fourth volume. The first pressure, the second pressure, and the fourth volume are all representation values that can be directly tested and are close to or consistent with the true value, so that the third volume obtained based on the first pressure, the second pressure, and the fourth volume has a higher accuracy, so that the accuracy of obtaining the second volume based on the third volume can be improved, thereby improving the accuracy of obtaining the true volume based on the second volume.

In some embodiments, placing a plurality of samples to be tested in a plurality of accommodating chambers of the second part in a one-to-one correspondence includes: the ratio of the volume of the sample to be tested to the volume of the accommodating chamber is greater than or equal to 2/3, and less than or equal to 1. In this way, the sample to be tested occupies most of the volume of the accommodating chamber, so that the volume of the test gas that can be passed into the accommodating chamber is relatively small, so that when the true volume of the sample to be tested is obtained based on the difference in volume between the accommodating chamber and the test gas in the accommodating chamber, the value of the difference in volume between the accommodating chamber and the test gas in the accommodating chamber is large, that is, the cardinality of the volume difference is large, and thus the error caused by the normal fluctuation of the volume difference to the test result can be ignored to a certain extent, thereby improving the reliability of the test result.

In some embodiments, before the test gas in the reference chamber is delivered to the selected accommodating chamber, the multiple accommodating chambers are placed in a constant temperature environment. In this way, the multiple accommodating chambers are placed in the same test environment, and since the sample changing step is omitted, the change in the test environment of the accommodating chamber caused by the sample changing process can be reduced, so that the consistency of the test environment of different accommodating chambers can be maintained during the entire test process, reducing the impact of environmental factors on the test results, so that the test results can represent the true performance of the sample to be tested.

In some embodiments, during the period when the selected accommodating chamber forms a negative pressure, the selected accommodating chamber and the reference chamber are connected so that the test gas in the reference chamber is delivered to the selected accommodating chamber. In this way, the test gas can be smoothly passed into the accommodating chamber, and there is no or almost no other gas in the accommodating chamber except the test gas, thereby reducing the interference of other gases in the accommodating chamber on the test results and ensuring the accuracy of the test results to a certain extent.

The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below.

BRIEF DESCRIPTION OF THE DRAWINGS

In the accompanying drawings, unless otherwise specified, the same reference numerals throughout the multiple drawings represent the same or similar parts or elements. These drawings are not necessarily drawn to scale. It should be understood that these drawings only depict some embodiments disclosed in the present application and should not be regarded as limiting the scope of the present application.

FIG1 is a schematic diagram of the structure of a solid-state battery in some embodiments of the present application;

FIG2 is a schematic diagram of a top view of a solid-state battery detection device according to some embodiments of the present application;

FIG3 is a schematic diagram of the front view of a solid-state battery detection device according to some embodiments of the present application;

FIG4 is a bottom view schematic diagram of a solid-state battery detection device according to some embodiments of the present application;

FIG5 is a schematic diagram of a gas path structure of a solid-state battery detection device according to some embodiments of the present application;

FIG6 is a schematic top view of the structure of a solid-state battery detection device according to some other embodiments of the present application;

FIG7 is a schematic diagram of the front view of a solid-state battery detection device according to some other embodiments of the present application;

FIG8 is one of the three-dimensional structural schematic diagrams of the solid-state battery detection device according to some embodiments of the present application;

FIG9 is a second schematic diagram of the three-dimensional structure of a solid-state battery detection device according to some embodiments of the present application;

FIG10 is a schematic diagram of one of the flow charts of the solid-state battery detection method according to some embodiments of the present application;

FIG11 is a second schematic flow chart of a solid-state battery detection method according to some embodiments of the present application;

FIG12 is a third flow chart of a solid-state battery detection method according to some embodiments of the present application;

FIG13 is a fourth flow chart of a solid-state battery detection method according to some embodiments of the present application;

FIG14 is a fifth flow chart of the solid-state battery detection method according to some embodiments of the present application.

Description of reference numerals:

A first sub-portion 1021, a second sub-portion 1022, a main body region 1022a, a peripheral region 1022b, a sealing member 1023, a first connecting portion 1031, a second connecting portion 1032, and a transition connecting portion 1033;

Solid-state battery 100, main body 100a, tab 100b, first portion 101, second portion 102, connecting portion 103, sub-connecting portion 103a, stopper 104, gas source 105, negative pressure mechanism 106;

Accommodating cavity 10, accommodating structure 10a, reference cavity 11;

Annular groove 20.

DETAILED DESCRIPTION

The following embodiments of the technical solution of the present application will be described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

In the description of the embodiments of the present application, the term "and/or" is only a description of the association relationship of associated objects, indicating that three relationships may exist. For example, A and/or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character "/" in this article generally indicates that the associated objects before and after are in an "or" relationship.

In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the embodiments of the present application.

In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

At present, from the perspective of market development, the application of power batteries is becoming more and more extensive. Power batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, electric cars, as well as military equipment and aerospace and other fields. With the continuous expansion of the application field of power batteries, the market demand is also constantly expanding.

The solid electrolyte of a solid-state battery usually includes a variety of solid particles, and the contact performance between the solid particles has a great influence on the performance of the solid-state battery. For example, if the contact ability between the solid particles is weak, it will lead to low transmission kinetics of charged ions between the solid particles, thus affecting the performance of the solid-state battery.

In other words, the densification performance of solid-state batteries has an important impact on the performance of solid-state batteries. In related technologies, in order to enable solid-state batteries to perform better, the densification performance of solid-state batteries is tested to obtain the degree of densification of solid-state batteries. Among them, changes in the test environment will have a greater impact on the test results.

For the same solid-state battery, its density uniformity is also one of the important factors affecting the performance of the solid-state battery. Therefore, in the process of testing the densification performance of the solid-state battery, samples are usually taken at different locations of the solid-state battery to prepare a plurality of different test samples, and these test samples are tested one by one. During the test process, it is necessary to change the sample to be tested. During the sample change process, the test environment will change, which may cause deviations in the test results of different samples to be tested. Due to changes in the test environment, it is impossible to accurately distinguish whether the deviation in the test results is caused by the test environment, or the deviation is caused by the inconsistent degree of densification of the sample itself, which makes the reliability of the test results low.

In addition, the above problems may occur even when testing samples taken from different solid-state batteries. This is because, for the same batch of solid-state batteries, the densification performance of solid-state batteries is usually consistent or very close to consistent. If there is a deviation between the test results of different samples, it cannot be ruled out that it is caused by changes in the test environment.

Based on the above considerations, a solid-state battery detection device is designed, including a first part, a second part and a connecting part. The first part has a reference cavity for loading test gas, and the second part includes a first sub-part and a second sub-part. The first sub-part has a plurality of accommodating grooves, and the second sub-part is arranged on the first sub-part to enclose the accommodating grooves to form an accommodating cavity, which is used to accommodate the sample to be tested. The connecting part is used to connect the reference cavity and the accommodating cavity, so that the test gas in the reference cavity is transported to the corresponding accommodating cavity through the connecting part.

The first sub-section has a plurality of receiving grooves forming receiving cavities, and different samples to be tested can be placed in the plurality of receiving cavities. The connecting portion connects the receiving cavity with the reference cavity, so that the test gas in the reference cavity is transported to the corresponding receiving cavity through the connecting portion, so as to test the samples to be tested in different receiving cavities respectively. In this way, multiple samples to be tested can be loaded at the same time, and during the test process, there is no need to change samples, so as to avoid changes in the test environment caused by the sample changing operation. In addition, the plurality of receiving grooves are located in the same first sub-section, so that the test environment in which the plurality of receiving grooves are located is consistent, further ensuring the consistency of the test environment in which the plurality of samples to be tested are located, reducing the test error of the samples to be tested caused by the different test environments, and can greatly improve the accuracy and reliability of the test results.

The solid-state battery disclosed in the embodiment of the present application can be used in, but not limited to, electrical devices such as vehicles, ships or aircraft. A power supply system having battery cells and batteries disclosed in the present application can be used to form the electrical device, which is conducive to improving the stability of the solid-state battery.

The embodiment of the present application provides an electric device using a battery as a power source, and the electric device may be, but is not limited to, a mobile phone, a tablet, a laptop, an electric toy, an electric tool, a battery car, an electric car, a ship, a spacecraft, etc. Among them, the electric toy may include a fixed or mobile electric toy, for example, a game console, an electric car toy, an electric ship toy, an electric airplane toy, etc., and the spacecraft may include an airplane, a rocket, a space shuttle, a spacecraft, etc.

Please refer to FIG. 1 , which is a schematic diagram of the structure of a solid-state battery in some embodiments of the present application.

The solid-state battery 100 includes a positive electrode sheet, a negative electrode sheet and a solid electrolyte. The solid electrolyte is located between the positive electrode sheet and the negative electrode sheet, and is used to form an ion channel between the positive electrode sheet and the negative electrode sheet to ensure the transfer and reaction of positive and negative ions. The material of the solid electrolyte may include oxides, phosphates, silicates, nitrides or sulfides. The positive electrode sheet, the negative electrode sheet and the solid electrolyte located between the positive electrode sheet and the negative electrode sheet are wound or stacked to form a solid-state battery. FIG1 shows the structure of a solid-state battery formed by stacking the positive electrode sheet, the negative electrode sheet and the solid electrolyte of the solid-state battery. The part of the positive electrode sheet and the negative electrode sheet with active substances constitutes the main body 100a of the solid-state battery, and the part of the positive electrode sheet and the negative electrode sheet without active substances constitutes the pole ear 100b. The pole ear 100b may be located at one end of the main body 100a or at both ends of the main body 100a. The shape of the solid-state battery may be rectangular, cylindrical, and the like.

Refer to Figures 2 and 3, Figure 2 is a top view structural schematic diagram of a solid-state battery detection device in some embodiments of the present application, and Figure 3 is a front view structural schematic diagram of a solid-state battery detection device in some embodiments of the present application.

The embodiment of the present application provides a solid-state battery detection device, which includes: a first part 101, wherein the first part 101 has a reference cavity, and the reference cavity is used to load the test gas. The solid-state battery detection device also includes: a second part 102, including: a first sub-part 1021, wherein the first sub-part 1021 has a plurality of receiving grooves, and the receiving grooves have a top opening; a second sub-part 1022, which covers the first sub-part 1021 and covers the top opening of the receiving groove to enclose a receiving cavity 10 with the receiving groove, and the receiving cavity 10 is used to receive the sample to be tested. The invisible receiving cavity 10 is shown by a dotted line in FIG. 2. The solid-state battery detection device also includes: a connecting part 103, which is used to connect the receiving cavity 10 with the reference cavity, so that the test gas in the reference cavity is transported to the corresponding receiving cavity 10 through the connecting part 103.

The first part 101 and the second part 102 may be two independent components, or two different parts of the same component that are spaced apart from each other.

The number of the plurality of accommodating grooves may be 2, 3, 4, 5, 6 or more.

The top opening of the receiving groove is disposed close to the second sub-portion 1022 .

In some embodiments, the second sub-portion 1022 may cover the entire first sub-portion 1021 , so that the second sub-portion 1022 can cover the top openings of the plurality of receiving grooves.

In other embodiments, the number of the second sub-portions 1022 may be multiple, and the multiple second sub-portions 1022 may be respectively located corresponding to different receiving grooves to respectively cover the top openings of the receiving grooves.

In some embodiments, the second sub-portion 1022 covers the first sub-portion 1021 , and the second sub-portion 1022 may only cover the top opening to close the top opening of the receiving groove.

In other embodiments, the second sub-portion 1022 may also have a plurality of protrusions disposed toward the first sub-portion 1021, the plurality of protrusions corresponding one-to-one to the plurality of receiving grooves, and each protrusion extends partially into the receiving groove to close the top opening of the receiving groove.

In some embodiments, the accommodating groove can be arranged on the surface of the first sub-portion 1021 close to the second sub-portion 1022, and the surface of the second sub-portion 1022 close to the first sub-portion 1021 is in contact with the surface of the first sub-portion 1021, thereby enhancing the sealing of the accommodating chamber 10 and reducing the risk of the test gas in the accommodating chamber 10 leaking to the outside.

The number of the reference chamber is one, and the connecting portion 103 connects each accommodating chamber 10 with the reference chamber. During the test, the test gas in the reference chamber is transported to the reference portion through the connecting portion 103.

The test gas may include, but is not limited to, one of helium, hydrogen, argon or xenon.

In some embodiments, the test gas can be used to detect the true volume of the sample to be tested, which is the volume of the sample to be tested minus the internal pores. The true volume can be used to characterize the densification degree of the sample to be tested. For example, the true volume can be used to calculate the true density, porosity, etc. of the sample to be tested.

The sample to be tested is obtained by sampling the solid-state battery. For example, the solid-state battery can be cut to obtain the sample to be tested. The shape of the sample to be tested can include but is not limited to circular, rectangular, triangular or other polygonal shapes.

In some embodiments, the multiple samples to be tested placed in the multiple accommodating cavities 10 of the second portion 102 may belong to the same solid-state battery. That is, samples are taken from different parts of the solid-state battery to detect the uniformity of the densification degree of the samples to be tested.

In other embodiments, at least some of the multiple samples to be tested placed in the multiple accommodating cavities 10 of the second portion 102 belong to different solid-state batteries.

FIG5 is a schematic diagram of the gas path structure of the solid-state battery detection device of some embodiments of the present application. As shown in FIG5, in some embodiments, the reference cavity 11 can be connected to the gas source 105, and the gas source 105 is used to deliver the test gas to the reference cavity 11. The first part 101 can have a vent hole, the vent hole is connected to the reference cavity 11, and the gas source 105 passes the test gas into the reference cavity 11 through the vent hole.

In some embodiments, the gas source 105 may include but is not limited to a gas cylinder or other structure capable of providing test gas.

As shown in Fig. 5, in some embodiments, the connecting portion 103 may also be connected to a negative pressure mechanism 106, and the negative pressure mechanism 106 is used to evacuate the accommodating chamber 10 through the connecting portion 103, so that the accommodating chamber 10 is in a negative pressure state. For example, before the test gas is introduced into the accommodating chamber 10, the accommodating chamber 10 may be evacuated to discharge the original gas in the accommodating chamber 10, so that the accommodating chamber 10 is in a vacuum state, which is convenient for the subsequent introduction of the test gas.

In some embodiments, the negative pressure mechanism 106 may include but is not limited to a structure capable of evacuating air, such as a vacuum pump.

In some embodiments, the negative pressure mechanism 106 and the connecting portion 103 may be connected via a delivery pipeline, and a valve (eg, a vacuum valve) may be provided on the delivery pipeline to control the flow or cutoff of gas in the delivery pipeline.

All parts of the reference cavity are sealed except for the vent hole and the connecting part 103. In this way, the test gas introduced into the reference cavity will not escape to the outside, and the gas to be tested can be accurately quantified when the true volume of the sample to be tested is detected.

The first part 101 may include a main body, the main body having an inner surface surrounding a reference cavity, and the main body also having a connecting hole and a vent hole, both of which penetrate the inner surface, the connecting hole is used to connect the connecting part 103, and the vent hole is used to connect the gas source 105.

In the above technical solution, since multiple samples to be tested are placed in the same first sub-section 1021, and the test gas of the reference chamber can be transported to different containing chambers 10 through the connecting section 103, there is no need to change samples during the testing of different samples to be tested, thereby reducing the change of the test environment and maintaining the consistency of the test environment. In addition, multiple containing tanks are located in the same first sub-section 1021, which is conducive to controlling the consistency of the test environment of multiple containing tanks located in the same first sub-section 1021, and further improving the consistency of the test environment of the samples to be tested located in multiple containing tanks. In this way, the influence of environmental factors on the test results can be eliminated, and the problem of different test results caused by inconsistent test environments of different samples to be tested is greatly reduced, and the test error of the samples to be tested due to different test environments is reduced, which can greatly improve the accuracy and reliability of the test results.

Refer to Figures 3 to 5, where Figure 4 is a bottom-up structural schematic diagram of a solid-state battery detection device in some embodiments of the present application.

According to some embodiments of the present application, the connecting portion 103 includes: a first connecting portion 1031, the first end of the first connecting portion 1031 is connected to the reference cavity 11; a plurality of second connecting portions 1032, the plurality of second connecting portions 1032 are connected to the plurality of accommodating cavities 10 in a one-to-one correspondence, wherein one end of the second connecting portion 1032 is connected to the accommodating cavity 10, and the other end is connected to the second end of the first connecting portion 1031.

That is to say, the test gas in the reference chamber can be transported to different second connecting portions 1032 through the first connecting portion 1031 , and then transported to different accommodating chambers 10 through different second connecting portions 1032 .

The first connecting portion 1031 has a channel for gas circulation therein, and both ends of the first connecting portion 1031 can be the two ends of the gas circulation channel respectively.

The second connecting portion 1032 has a gas circulation channel therein, and the first end and the second end of the second circulation portion can be two ends of the gas circulation channel respectively.

In some embodiments, each second connecting portion 1032 may be directly connected to the second end of the first connecting portion 1031 .

As shown in FIG. 3 and FIG. 4 , in other embodiments, the connecting portion 103 may further include a transition connecting portion 1033 connecting the first connecting portion 1031 and the second connecting portion 1032. The transition connecting portion 1033 may have multiple branches, each of which can serve as a channel for gas circulation. The transition connecting portion 1033 is connected to the second end of the first connecting portion 1031 so that the test gas can be delivered to each branch through the first connecting portion 1031.

Each branch may be connected to at least one second connecting portion 1032 , so that the test gas is delivered to the second connecting portion 1032 through the branch.

Exemplarily, the transition connecting portion 1033 can have three branches, which are connected to each other and form an "I"-shaped structure. The branch located in the middle can be connected to the second end of the first connecting portion 1031, and the branches located at both ends can be respectively connected to multiple second connecting portions 1032, for example, can be respectively connected to three second connecting portions 1032.

By providing the transition connecting portion 1033 , the first connecting portion 1031 can be connected to more second connecting portions 1032 , thereby achieving testing of a larger number of samples to be tested in the accommodating cavity 10 .

In some embodiments, the first connecting portion 1031 and the second connecting portion 1032 may include, but are not limited to, a structure having a gas flow channel such as a delivery pipe.

In some embodiments, the first connecting portion 1031 may also be provided with a shutoff member, so that when no detection is required, the shutoff member can cut off the flow of the test gas from the first connecting portion 1031 to each second connecting portion 1032 . The shutoff member may be a valve.

In the above technical solution, the test gas can be introduced into the corresponding accommodating chamber 10 through the plurality of second connecting parts 1032, so that the plurality of samples to be tested can be tested independently, and the test results do not interfere with each other, thereby improving the accuracy of the test results of each sample to be tested. In addition, by connecting the plurality of second connecting parts 1032 and the reference chamber through a first connecting part 1031, the connection between the first connecting part 1031 and the second part 102 can be greatly simplified, thereby simplifying the structure of the entire detection device.

Refer to FIG. 6 , which is a schematic diagram of a top view of the structure of a solid-state battery detection device according to other embodiments of the present application.

According to some embodiments of the present application, the communication portion 103 includes: a plurality of sub-communication portions 103 a , each of which is respectively connected to a receiving cavity and a reference cavity.

The first portion 101 may have the same number of communication holes as the plurality of sub-communication portions 103 a , so that the plurality of sub-communication portions 103 a are connected to the plurality of sub-communication portions 103 a in a one-to-one correspondence.

Each sub-connection portion 103 a has a channel for the test gas to flow therein, and the multiple sub-connection portions 103 a are independent of each other so that the transmission of the test gas between different sub-connection portions 103 a is not interfered with each other.

In some embodiments, the sub-connecting portion 103a may include, but is not limited to, a structure having a gas flow channel such as a delivery pipe.

In the above technical solution, the reference chamber and different accommodating chambers are respectively connected through different sub-connecting parts 103a, so that no crosstalk occurs between the test gases entering different accommodating chambers, thereby improving the independence of independent testing of multiple samples to be tested and improving the accuracy of the test results.

3 , according to some embodiments of the present application, the connecting portion 103 includes: a plurality of shutoff members 104 , the plurality of shutoff members 104 correspond one-to-one to the plurality of accommodating chambers 10 , and the shutoff members 104 are used to shut off the test gas from entering the accommodating chamber 10 through the connecting portion 103 .

When the connecting portion 103 includes a first connecting portion 1031 and multiple second connecting portions 1032, multiple shut-off members 104 can be arranged one-to-one corresponding to the multiple second connecting portions 1032, and the shut-off members 104 can be arranged on the second connecting portions 1032 to prevent the test gas from flowing in the second connecting portions 1032, thereby preventing the test gas from entering the accommodating cavity 10.

When the connecting portion 103 includes multiple sub-connecting portions 103a, multiple shut-off pieces 104 can be arranged one-to-one corresponding to the multiple sub-connecting portions 103a, and the shut-off pieces 104 can be arranged on the sub-connecting portions 103a to prevent the test gas from flowing in the sub-connecting portions 103a, thereby preventing the test gas from entering the accommodating cavity 10.

In some embodiments, the stop member 104 may include, but is not limited to, a valve or other structure capable of preventing the test gas from flowing through the connecting portion 103 .

In the above technical solution, the cutoff member 104 can cut off the test gas from entering the accommodating chamber 10 that does not need to be tested, so that multiple accommodating chambers 10 and the reference chamber are connected in sequence, thereby making the tests of multiple samples to be tested unaffected, further improving the accuracy of the test results.

Referring to Figures 7 to 9, Figure 7 is a front view structural diagram of a solid-state battery detection device of other embodiments of the present application; Figure 8 is one of the three-dimensional structural diagrams of a solid-state battery detection device of some embodiments of the present application; and Figure 9 is a second three-dimensional structural diagram of a solid-state battery detection device of some embodiments of the present application.

According to some embodiments of the present application, the second portion 102 further includes: a sealing member 1023 , located between the first sub-portion 1021 and the second sub-portion 1022 , and used for sealing the top opening of the receiving groove.

The sealing member 1023 achieves a sealing effect by closing the top opening of the receiving groove. Exemplarily, the sealing member 1023 may be in the shape of a sheet and located on the top opening of the receiving groove. Alternatively, the sealing member 1023 may also be in the shape of a cover and cover the top opening of the receiving groove. Alternatively, the sealing member 1023 may also be inserted into a portion of the receiving groove to block the top opening of the receiving groove.

In some embodiments, the material of the seal 1023 may be an elastic material, and the elastic material may include but is not limited to rubber, silicone rubber, polyurethane, etc. In other embodiments, the material of the seal 1023 may also include plastic, graphite, ceramic, asbestos, etc.

In some embodiments, the second sub-section 1022 may include a main body area and a peripheral area arranged around the periphery of the main body area. The main body area is recessed in a direction away from the first sub-section 1021 compared to the peripheral area. The sealing member 1023 is located between the second sub-section 1022 corresponding to the main body area and the first sub-section 1021, so that the main body area can provide a certain accommodation space for the sealing member 1023, and at the same time, the second sub-section 1022 corresponding to the peripheral area can be attached to the surface of the first sub-section 1021, further enhancing the sealing performance of the accommodating cavity 10.

In the above technical solution, the top opening is sealed by the sealing member 1023 , thereby ensuring the sealing of the accommodating chamber 10 to a certain extent, thereby improving the accuracy and reliability of the test results.

Referring to Figure 8, according to some embodiments of the present application, the first sub-section 1021 includes: a plurality of accommodating structures 10a, each accommodating structure 10a having an accommodating groove formed therein; an annular groove 20, the annular groove 20 being arranged around the outer periphery of the accommodating structure 10a; the sealing member 1023 includes: a top cover; an extension portion, which is arranged around the outer periphery of the top cover and is connected to the top cover, the extension portion extends into the annular groove 20, and the top cover closes the top opening of the accommodating groove.

The shape of the accommodating structure 10a may include but is not limited to a columnar shape, which may include but is not limited to a cylindrical shape, a rectangular parallelepiped shape, a prism shape, etc. The accommodating groove may penetrate the entire accommodating structure 10a along the height direction of the accommodating structure 10a, or may only penetrate a portion of the height of the accommodating groove.

The plurality of accommodating structures 10a are independent parts of the first sub-section 1021. The annular groove 20 may be arranged around the outer periphery of the accommodating structure 10a of a part of the height, or around the outer periphery of the accommodating structure 10a of the entire height. The first sub-section 1021 has an inner surface that forms the annular groove 20. Due to the arrangement of the annular groove 20, there is a gap between the accommodating structure 10a and the inner surface that forms the annular groove 20.

The annular groove 20 has an opening close to the second sub-portion 1022, so that the extension can extend into the annular groove 20 along the opening. Along the depth direction of the annular groove 20, the size of the extension is not greater than the depth dimension of the annular groove 20, so that the annular groove 20 can accommodate the entire extension, so that the top cover can cover the top opening of the receiving groove. Exemplarily, the top cover can abut against the edge of the top opening of the receiving groove, so that the top cover can have a better sealing effect on the top opening of the receiving groove.

In the above technical solution, the protruding portion extends into the annular groove 20 to fix the position of the top cover, so that the top cover stably seals the top opening of the accommodating groove to maintain a good sealing performance of the accommodating chamber 10, and the annular groove 20 surrounds the outer circumference of the accommodating structure 10a, so that the protruding portion does not occupy the volume of the accommodating chamber 10. When the test results of the sample to be tested are subsequently obtained based on the volume of the accommodating chamber 10 and the volume of the test gas located in the accommodating chamber 10, the volume of the accommodating chamber 10 used in the actual test process is consistent with the actual volume of the accommodating chamber 10, which is beneficial to improving the accuracy of the test results.

According to some embodiments of the present application, the protruding portion is threadedly connected to an inner surface of the first sub-portion 1021 for forming an annular groove 20 .

The outer surface of the extension portion may have an external thread, and the inner surface of the first sub-portion 1021 for forming the annular groove 20 may have an internal thread matching the external thread. The outer surface of the extension portion referred to here refers to the surface of the extension portion away from the receiving groove.

In other embodiments, the inner surface of the protruding portion may have an internal thread, that is, the surface of the protruding portion close to the accommodating groove may have an internal thread, and the outer surface of the accommodating structure 10a may have an external thread, that is, the surface of the accommodating structure 10a close to the annular groove 20 has an external thread, so that the protruding portion is threadedly connected to the accommodating structure 10a.

In the above technical solution, by means of threaded connection, on the one hand, the protruding portion can be fixed in the annular groove 20, thereby improving the stability of the top cover located at the top opening of the accommodating groove; on the other hand, the sealing between the protruding portion and the inner surface used to form the annular groove 20 can be improved, thereby reducing the risk of test gas escaping from the gap between the protruding portion and the annular groove 20, further improving the accuracy and reliability of the test results.

According to some embodiments of the present application, the connecting portion 103 is connected to the other end of the containing groove opposite to the top opening.

The accommodating groove may penetrate the accommodating structure 10 a , and the accommodating groove has a top opening and a bottom opening opposite to each other, and the communicating portion 103 is in communication with the bottom opening of the accommodating groove.

In some embodiments, the size of the top opening may be larger than that of the bottom opening to reduce the probability of test gas escaping from the bottom opening. The larger size of the top opening can provide a larger entrance for sample placement, which is beneficial for sample placement.

In other embodiments, the size of the top opening may also be equal to the size of the bottom opening.

During the testing process, the top opening is closed, and the connecting portion 103 continuously delivers the test gas into the accommodating chamber 10 through the bottom opening until the test gas fills the entire accommodating chamber 10 .

When the gas source 105 continuously delivers the test gas to the reference chamber, so that the connecting portion 103 continuously delivers the test gas to the accommodating chamber 10, it can be ensured that when the test gas fills the space in the accommodating chamber 10 except for the sample to be tested, the test gas in the accommodating chamber 10 will not flow back into the reference chamber through the connecting portion 103, thereby ensuring the stability of the test process.

In some embodiments, when the communication portion 103 includes a first communication portion 1031 and a plurality of second communication portions 1032 , each second communication portion 1032 may be connected to a bottom opening of the receiving groove.

In other embodiments, when the connecting portion 103 includes a plurality of sub-connecting portions 103 a , each sub-connecting portion 103 a may be connected to the bottom opening of the receiving groove.

In the above technical solution, compared with the connecting portion 103 connecting the side wall of the receiving groove, it can avoid the problem of the connecting portion 103 passing through multiple receiving grooves to connect the receiving grooves respectively to a certain extent, and simplify the routing method of the connecting portion 103.

An embodiment of the present application provides a battery production device, which includes the solid-state battery detection device in the above embodiment.

The battery production equipment can be used for the production of solid-state batteries. For the structure of the solid-state batteries, reference can be made to the relevant description of the above embodiments.

After the solid-state battery is prepared, one or several of them can be extracted for sampling to obtain the sample to be tested, and the sample to be tested can be tested using a solid-state battery testing device. The test results can be used to characterize the degree of densification of the solid-state battery.

With reference to FIG. 5 and FIG. 10 , FIG. 10 is one of the flow charts of the solid-state battery detection method according to some embodiments of the present application.

The present application embodiment provides a solid-state battery detection method, which is applied to the solid-state battery detection device of the above embodiment, and the method includes:

Step 110, introducing a test gas into the reference cavity of the first part 101;

Step 120, placing a plurality of samples to be tested in a corresponding manner in a plurality of receiving grooves of the first sub-part, and making the second sub-part cover the top openings of the receiving grooves, so that the samples to be tested are located in the receiving cavity 10;

Step 130, selecting a plurality of accommodating chambers 10 in sequence, and connecting the selected accommodating chambers with the reference chamber, so that the test gas in the reference chamber is transported to the selected accommodating chamber;

Step 140 , testing the sample to be tested in the selected accommodating cavity.

The test gas may include, but is not limited to, one of helium, hydrogen, argon or xenon.

The sample to be tested is obtained by sampling the solid-state battery. For example, the solid-state battery can be cut to obtain the sample to be tested. The shape of the sample to be tested can include but is not limited to circular, rectangular, triangular or other polygonal shapes.

In some embodiments, the multiple samples to be tested placed in the multiple accommodating cavities 10 of the second portion 102 may belong to the same solid-state battery. That is, samples are taken from different parts of the solid-state battery to detect the uniformity of the densification degree of the samples to be tested.

In other embodiments, at least some of the multiple samples to be tested placed in the multiple accommodating cavities 10 of the second portion 102 belong to different solid-state batteries.

The reference cavity may be connected to a gas source 105 , and the gas source 105 is used to provide a test gas to the reference cavity.

In some embodiments, step 110 may be performed before step 120. Test gas is introduced into the reference cavity 11 of the first part 101 so that the test gas fills the entire reference cavity 11. In order to prevent the test gas in the reference cavity 11 from entering the accommodating cavity 10 before the test is started, a stopper 104 may be used to stop the test gas in the communicating portion 103 from being transmitted to the accommodating cavity 10. When the stopper 104 is a valve and the valve is disposed in the communicating portion 103, the valve may be closed to cut off the flow of the test gas in the communicating portion 103.

Afterwards, multiple samples to be tested are placed one by one in multiple containing tanks, and the second sub-part covers the top opening of the containing tank. After the test starts, it is only necessary to control the connecting part 103 to pass the test gas into the containing chamber 10 one by one, so as to detect the samples to be tested loaded in the multiple containing tanks respectively, without changing the samples during the test.

In other embodiments, step 110 may also be performed after step 120. That is, a plurality of samples to be tested are first placed one by one in a plurality of accommodating chambers 10, and after the samples to be tested are placed in place, a test gas is introduced into the reference chamber 11, and the test gas in the reference chamber 11 is transmitted to the accommodating chamber 10 one by one through the connecting portion 103.

Selecting multiple accommodating chambers 10 in sequence means that one accommodating chamber 10 is selected each time, and the test gas is introduced into the selected accommodating chamber to test the sample to be tested in the selected accommodating chamber. After the test is completed, the next accommodating chamber 10 is selected, and the test gas is introduced into the accommodating chamber 10 to test the sample to be tested in the accommodating chamber 10. This process is repeated in this way until all accommodating chambers 10 are selected.

In the above technical solution, since a plurality of accommodating chambers 10 are provided in the second part 102, it is possible to simultaneously load a plurality of samples to be tested and test them in sequence, thereby eliminating the step of changing samples and improving the efficiency of testing a plurality of samples to be tested. At the same time, since the step of changing samples is eliminated, the change of the test environment of the accommodating chamber 10 caused by the sample changing process can be reduced, the consistency of the test environment of a plurality of samples to be tested is ensured, the test error of the samples to be tested caused by the different test environments is reduced, and the accuracy and reliability of the test results of the samples to be tested can be greatly improved. In this way, the test results of the samples to be tested of the same batch can be analyzed, and the production process of the solid-state battery can be evaluated based on the results of the analysis. Since the test environment of the samples to be tested of the same batch is consistent, the difference between the test results of the samples to be tested of the same batch has a high reference value for the evaluation of the production process.

With reference to FIG. 5 and FIG. 11 , FIG. 11 is a second flow chart of the solid-state battery detection method according to some embodiments of the present application.

According to some embodiments of the present application, step 130 includes:

Step 131, selecting a target accommodating cavity;

Step 132 , connecting the reference cavity 11 and the target accommodating cavity, and cutting off the connection between the remaining accommodating cavities 10 and the reference cavity 11 .

That is to say, during the test of the sample to be tested in the target accommodating chamber, the test gas is only introduced into the target accommodating chamber, and the target accommodating chamber refers to the currently selected accommodating chamber.

In some embodiments, the connecting portion 103 of the solid-state battery detection device includes a first connecting portion 1031 and multiple second connecting portions 1032, the first end of the first connecting portion 1031 is connected to the reference cavity, the multiple second connecting portions 1032 are connected one-to-one with the multiple accommodating cavities 10, one end of the second connecting portion 1032 is connected to the accommodating cavity 10, and the other end is connected to the second end of the first connecting portion 1031. Then, in step 132, the first connecting portion 1031 and the second connecting portion 1032 corresponding to the target accommodating cavity are connected, and the connection between the first connecting portion 1031 and the second connecting portions 1032 corresponding to other accommodating cavities is cut off.

The structures of the first connecting portion 1031 and the second connecting portion 1032 may refer to the related description of the above embodiment, which will not be described in detail below.

In some embodiments, each second connecting portion 1032 is provided with a shutoff piece 104. When the test gas needs to be introduced into the target accommodating chamber, the shutoff piece 104 can be configured to allow the test gas in the second connecting portion 1032 to flow, thereby controlling the test gas in the reference chamber to be transported to the target accommodating chamber through the first flow portion and the second flow portion. The shutoff piece 104 of the second connecting portion 1032 connected to other accommodating chambers 10 is configured to cut off the flow of the test gas in the second flow portion, so that the test gas in the reference chamber can only be transported to the target accommodating chamber, thereby accurately quantifying the test gas in the accommodating chamber 10, and thereby obtaining accurate test results.

In other embodiments, the solid-state battery detection device includes a plurality of sub-connecting parts, each of which is connected to a receiving cavity and a reference cavity respectively. In step 132, only the sub-connecting part between the target receiving cavity and the reference cavity may be connected, and the connection between the remaining receiving cavities and the reference cavity may be cut off. Each sub-connecting part may be provided with a cut-off member, and the cut-off member is used to control the opening and closing of the sub-connecting part.

In some embodiments, the cut-off member 104 may include but is not limited to a valve or other structures, and the connecting portion 103 may be a delivery pipe, and the valve is disposed on the delivery pipe to control the flow of the test gas in the delivery pipe. In the above technical solution, the samples to be tested can be tested one by one, and during the process of testing the current sample to be tested, the test gas will not enter other accommodating chambers 10, which is conducive to quantifying the test gas in the accommodating chamber 10 being tested, thereby improving the accuracy of the test results of the samples to be tested.

According to some embodiments of the present application, step 140 includes: obtaining the true volume of the sample to be tested, where the true volume is the volume of the sample to be tested minus the internal pores.

The true volume can be used to characterize the densification degree of the sample to be tested. For example, the porosity or true density of the sample to be tested can be obtained based on the true volume of the sample to be tested.

Exemplarily, the method for obtaining the porosity of the sample to be tested based on the true volume of the sample to be tested may include: obtaining the surface volume of the sample to be tested, the apparent volume refers to the sum of the real volume of the sample to be tested and the volume of the closed pores of the sample to be tested, in other words, the apparent volume of the sample to be tested refers to the visible volume of the sample to be tested; obtaining the porosity of the sample to be tested based on the apparent volume and the true volume. Exemplarily, the porosity of the sample to be tested may be obtained based on the following formula (1).

(1)

Where V represents the true volume of the sample to be tested, and _V0 represents the apparent volume of the sample to be tested.

Porosity is used to characterize the ratio of the pore volume inside the sample to be tested to the apparent volume of the sample to be tested. The larger the porosity value, the larger the volume of the pores inside the sample to be tested and the higher the degree of densification.

Exemplarily, the method for obtaining the true density of the sample to be tested based on the true volume of the sample to be tested may include: obtaining the mass of the sample to be tested; and obtaining the true density of the sample to be tested based on the following formula (2).

(2)

Wherein, m represents the mass of the sample to be tested, and V represents the true volume of the sample to be tested. The greater the true density of the sample to be tested, the higher the degree of densification of the sample to be tested.

Since the true volume is the volume of the sample to be tested minus the internal pores, the obtained true density can truly reflect the density of the sample to be tested, and thus can accurately characterize the densification degree of the sample to be tested.

In some embodiments, the mass and apparent volume of the sample to be tested may be obtained before the sample to be tested is placed in the containing cavity.

In the above technical solution, by obtaining the true volume of the sample to be tested, the error caused by the pores in the sample to be tested in characterizing the densification degree of the sample to be tested can be reduced, thereby accurately characterizing the densification degree of the sample to be tested.

Refer to Figure 12, which is a third flow chart of the solid-state battery detection method in some embodiments of the present application.

According to some embodiments of the present application, obtaining the true volume of the sample to be tested includes:

Step 141, obtaining a first volume of the selected accommodating cavity;

Step 142, obtaining a second volume of the test gas in the selected accommodating chamber;

Step 143: Obtain the true volume based on the difference between the first volume and the second volume.

The test gas in the accommodating chamber can enter the internal pores of the sample to be tested, that is, the second volume also includes the volume of the pores inside the sample to be tested. In this way, after subtracting the second volume of the test gas from the overall volume of the accommodating chamber, the remaining volume can truly represent the true volume of the sample to be tested.

It is understandable that the internal pores referred to may be open pores inside the sample to be tested, so that the test gas can enter the open pores. The open pores may be pores inside the sample to be tested that are connected to the outside.

Exemplarily, when measuring the first volume of the accommodating cavity, the liquid can be poured into the entire accommodating cavity, and the volume of the liquid is the first volume. The volume of the liquid can be measured by a measuring cup.

In some embodiments, after the test gas in the reference chamber is passed into the containing chamber, the gas pressure of the containing chamber is 100Kpa~600Kpa, and it is left to stand for 2min~10min. Under the above conditions, the test gas can fill the pores inside the sample to be tested, thereby making the obtained true volume result more accurate.

Since the test gas can fill the entire containing cavity and enter the pores inside the sample to be tested, the principle of gas displacement is used. The remaining volume after subtracting the second volume from the first volume is the true volume of the sample to be tested. This can eliminate the influence of the pores inside the sample to be tested on the test results, so that the obtained true volume is close to or consistent with the true value.

Refer to Figure 13, which is a fourth flow chart of the solid-state battery detection method in some embodiments of the present application.

According to some embodiments of the present application, step 142 includes:

Step 1421, obtaining the total volume of the test gas in the reference chamber and the selected containing chamber after the reference chamber and the selected containing chamber are connected, as the third volume;

Step 1422, obtaining a fourth volume of the reference cavity;

Step 1423: Obtain the second volume based on the difference between the third volume and the fourth volume.

After the reference chamber and the selected accommodating chamber are connected, the test gas only flows in the reference chamber and the selected accommodating chamber, there is no sample to be tested in the reference chamber, the test gas fills the entire reference chamber, and the volume of the reference chamber is the volume of the test gas in the reference chamber. Therefore, by obtaining the fourth volume of the reference chamber and subtracting the fourth volume from the total volume of the test gas, the second volume of the test volume in the selected accommodating chamber can be obtained.

In some embodiments, when measuring the fourth volume of the reference cavity, the liquid may be poured into the entire reference cavity, and the volume of the liquid is the fourth volume. The volume of the liquid may be measured by a measuring cup.

In the above technical solution, the second volume of the test gas in the accommodating chamber can be obtained by subtracting the volume of the reference chamber from the total volume of the test gas. In this way, the second volume of the test gas can be calculated quickly and accurately.

According to some embodiments of the present application, during the period when the selected accommodating chamber is in communication with the reference chamber, the test gas is continuously introduced into the reference chamber.

5 , illustratively, the test gas can be continuously introduced into the reference chamber through the gas source 105, that is, while the test gas in the reference chamber flows out to the accommodating chamber 10, the gas source 105 will replenish new test gas into the reference chamber to keep the reference chamber filled with test gas.

It can be understood that, since all parts of the reference chamber except the connection gas source 105 and the connection portion 103 are sealed, the lifted gas in the reference chamber will not escape to the outside, thereby enabling accurate quantification of the test gas.

In the above technical solution, it can be ensured that the reference chamber is always filled with test gas, so that the volume of the reference chamber can accurately represent the volume of the test gas in the reference chamber, thereby making the calculated value of the second volume more accurate.

Refer to Figure 14, which is a fifth flow chart of the solid-state battery detection method of some embodiments of the present application.

According to some embodiments of the present application, step 1421 includes:

Step 14211, obtaining a first pressure before the reference chamber and the selected accommodating chamber are connected and when the reference chamber is filled with the test gas;

Step 14212, obtaining a second pressure of the reference chamber after the reference chamber and the selected accommodating chamber are connected;

Step 14213, obtaining a third volume based on the first pressure, the second pressure, and the fourth volume.

The first pressure and the second pressure of the reference chamber referred to here refer to the pressure of the reference chamber.

In some embodiments, the pressure of the reference chamber can be measured by a pressure gauge, and a probe of the pressure gauge can be placed in the reference chamber to measure the pressure of the reference chamber.

In some embodiments, the third volume may be obtained based on the first pressure, the second pressure, the fourth volume, and Boyle's law. Boyle's law describes the relationship that when a certain mass of a certain gas remains constant at a constant temperature, the product of its pressure and volume remains constant.

Before the reference chamber and the containing chamber are connected, the test gas is only located in the reference chamber, at which time the volume of the test gas is the fourth volume, and the pressure in the reference chamber is the first pressure. After the reference chamber and the containing chamber are connected, the test gas is located in the reference chamber and the containing chamber, at which time the volume of the test gas is the third volume, and the pressure in the reference chamber is the second pressure. Based on Boyle's law, the product of the first pressure and the fourth volume is equal to the product of the second pressure and the third volume.

Based on this, the third volume can be calculated using the following formula (3).

(3)

_V3 represents the third volume, _V4 represents the fourth volume, _P1 represents the first pressure, and _P2 represents the second pressure.

In the above technical solution, the first pressure, the second pressure and the fourth volume are all representation values that can be directly tested and are close to or consistent with the real values, so that the accuracy of the third volume obtained based on the first pressure, the second pressure and the fourth volume is higher. In this way, the accuracy of obtaining the second volume based on the third volume can be improved, thereby improving the accuracy of obtaining the true volume based on the second volume.

According to some embodiments of the present application, step 120 includes: a ratio of the volume of the sample to be tested to the volume of the accommodating cavity is greater than or equal to 2/3 and less than or equal to 1.

Exemplarily, the ratio of the volume of the sample to be tested to the volume of the accommodating cavity may be 3/4.

The sample to be tested can be cut into a shape that is the same as the cross-sectional shape of the accommodating cavity, and the area of the sample to be tested is the same as or slightly smaller than the cross-sectional area of the accommodating cavity. In this way, when calculating the ratio of the volume of the sample to be tested to the volume of the accommodating cavity, it is mainly necessary to consider the ratio of the height of the sample to be tested and the height of the accommodating cavity, thereby simplifying the preparation of the sample to be tested.

Alternatively, the sample to be tested may be cut into other shapes that are different from the cross-sectional shape of the accommodating cavity, and the area of the sample to be tested and the cross-sectional area of the accommodating cavity may also have a large difference. It is only necessary to measure the apparent volume of the sample to be tested before testing the sample, and compare the apparent volume with the volume of the accommodating cavity.

It can be understood that if the volume of the sample to be tested is small, the volume of the test gas in the accommodating chamber is relatively large. When the true volume of the sample to be tested is obtained based on the difference in volume between the accommodating chamber and the test gas in the accommodating chamber, the difference in volume between the accommodating chamber and the test gas in the accommodating chamber is smaller.

The volume of the test gas in the accommodating chamber may fluctuate, which may result in a slight difference in the volume of the accommodating chamber and the test gas in the accommodating chamber even when there is no sample to be tested in the accommodating chamber. Therefore, if the volume of the sample to be tested is small, so that the value of the difference between the measured volume of the accommodating chamber and the test gas in the accommodating chamber is itself small, the error caused by the normal fluctuation of the test gas will have a greater impact on the test result.

In the above technical scheme, since the sample to be tested occupies most of the volume of the accommodating chamber, the volume of the test gas that can enter the accommodating chamber is relatively small. Therefore, when the true volume of the sample to be tested is obtained based on the difference in volume between the accommodating chamber and the test gas in the accommodating chamber, the difference in volume between the accommodating chamber and the test gas in the accommodating chamber is larger, that is, the cardinality of the volume difference is larger, and thus the error caused by the normal fluctuation of the volume difference to the test result can be ignored to a certain extent, thereby improving the reliability of the test result.

According to some embodiments of the present application, before the test gas in the reference chamber is delivered to the selected containing chamber, the multiple containing chambers are placed in a constant temperature environment.

Exemplarily, the temperature of the constant temperature environment may be 25°C to 60°C. Exemplarily, it may be 35°C. The multiple accommodating chambers 10 are all in the same constant temperature environment, that is, the temperatures of the multiple accommodating chambers 10 are kept consistent. The multiple accommodating chambers being in a constant temperature environment referred to here may mean that the ambient temperature in the multiple accommodating chambers is in a constant temperature environment.

In some embodiments, the temperature of the accommodating cavity 10 can be controlled by controlling the overall temperature of the first part 101 using the principle of heat transfer. For example, the overall temperature of the first part 101 can be controlled by using a heater, or by placing the overall first part 101 in a heating mechanism such as an oven.

In some embodiments, the accommodating chamber 10 may be placed in a constant temperature environment before placing a plurality of samples to be tested in the accommodating chamber 10. After that, the samples to be tested are placed in the accommodating chamber 10 and allowed to stand for 1 to 10 minutes before the test gas is introduced into the accommodating chamber 10. In this way, before the test, the temperature of the samples to be tested is consistent with the temperature of the constant temperature environment, so that the accuracy of the test results is higher.

It is understandable that, during the process of introducing the test gas into the accommodating chamber 10 , the temperature of the accommodating chamber 10 is always maintained at a constant temperature, so that the ambient temperature of different samples to be tested is consistent during testing.

In the above technical scheme, multiple accommodating chambers 10 are under the same test environment, and since the sample changing step is omitted, the changes in the test environment of the accommodating chamber 10 caused by the sample changing process can be reduced, so that during the entire test process, the consistency of the test environment of different accommodating chambers 10 can be maintained, reducing the impact of environmental factors on the test results, so that the test results can represent the true performance of the sample to be tested.

According to some embodiments of the present application, during the period when the selected accommodating chamber forms a negative pressure, the selected accommodating chamber and the reference chamber are connected so that the test gas in the reference chamber is transported to the selected accommodating chamber.

In some embodiments, after the sample to be tested is placed in the selected containing cavity, the selected containing cavity can be evacuated to form a negative pressure in the selected containing cavity and to remove the original gas in the internal pores of the sample to be tested. Subsequently, when the test gas is introduced into the selected containing cavity, the test gas can smoothly enter the pores of the sample to be tested and reduce the interference of the original gas in the internal pores of the sample to be tested on the test results.

In some embodiments, after placing the sample to be tested in the selected receiving chamber, the selected receiving chamber may be subjected to at least one step of evacuating the selected receiving chamber. Exemplarily, the receiving chamber 10 may be subjected to repeated steps of evacuating and breaking the vacuum to reduce the residual original gas. Evacuating refers to evacuating the receiving chamber 10 so that the gas pressure in the receiving chamber 10 is 0~20Pa, and breaking the vacuum refers to, after the receiving chamber 10 is evacuated, introducing gas into the receiving chamber 10 so that the gas pressure in the receiving chamber 10 returns to normal. In one example, the steps of evacuating and breaking the vacuum may be performed 2~6 times on the receiving chamber 10. In some embodiments, when breaking the vacuum, a test gas may be introduced into the receiving chamber 10 to further reduce the residual original gas.

In some embodiments, a vacuum pump may be used to evacuate the accommodating chamber 10. The vacuum pump is connected to the connecting portion 103, and evacuates the accommodating chamber 10 through the connecting portion 103.

In the above technical solution, the test gas can be smoothly introduced into the accommodating chamber 10, and there is no or almost no gas other than the test gas in the accommodating chamber 10, thereby reducing the interference of other gas test results in the accommodating chamber 10 and ensuring the accuracy of the test results to a certain extent.

An embodiment of the present application provides a solid-state battery detection device, referring to Figures 2 to 5 and Figures 7 to 9, which includes: a first part 101, the first part 101 has a reference cavity, and the reference cavity is used to load a test gas; a second part 102, the second part 102 includes: a first sub-part, the first sub-part has a plurality of receiving grooves, the receiving grooves have a top opening, a second sub-part, which covers the first sub-part and covers the top openings of the receiving grooves to enclose a receiving cavity 10 with the receiving grooves, and the receiving cavity 10 is used to receive a sample to be tested; a connecting part 103, which is used to connect the receiving cavity 10 with the reference cavity, so that the test gas in the reference cavity is transported to the corresponding receiving cavity 10 through the connecting part 103.

The communication part 103 includes: a first communication part 1031, a first end of the first communication part 1031 is connected to the reference cavity; and a plurality of second communication parts 1032, the plurality of second communication parts 1032 are connected to the plurality of accommodating cavities 10 in a one-to-one correspondence, wherein one end of the second communication part 1032 is connected to the accommodating cavity 10, and the other end is connected to the second end of the first communication part 1031. The first communication part 1031 is provided with a valve for controlling the flow of the test gas in the first communication part 1031. Each second communication part 1032 is provided with a valve for controlling the flow of the test gas in each second communication part 1032.

The first sub-section 1021 includes: a plurality of accommodating structures 10 a , each accommodating structure 10 a has an accommodating groove formed therein, and the accommodating groove has a top opening; and an annular groove 20 arranged around the outer circumference of the accommodating structure 10 a .

The second part 102 further includes: a sealing member 1023, located between the first sub-part 1021 and the second sub-part 1022, for sealing the top opening of the receiving groove. The sealing member 1023 includes: a top cover; an extension portion, which is arranged around the outer periphery of the top cover and connected to the top cover, and the extension portion extends into the annular groove 20, and the top cover closes the top opening of the receiving groove. The extension portion is threadedly connected to the inner surface of the first sub-part 1021 for forming the annular groove 20.

The present application also provides a solid-state battery detection method. Referring to FIG. 10 , the method includes:

Step 110, introducing a test gas into the reference cavity of the first part 101;

Step 120, placing a plurality of samples to be tested in a plurality of receiving grooves of the first sub-part in a one-to-one correspondence, and making the second sub-part cover the top openings of the receiving grooves, so that the samples to be tested are located in the receiving cavity 10;

Step 130, selecting a plurality of accommodating chambers 10 in sequence, and connecting the selected accommodating chambers with the reference chamber, so that the test gas in the reference chamber is transported to the selected accommodating chamber;

Step 140 , testing the sample to be tested in the selected accommodating cavity.

Step 110 and step 120 may be performed simultaneously or sequentially, and the order of step 110 may be swapped.

In step 110 , the test gas may be introduced into the reference chamber through the gas source 105 connected to the reference chamber.

In step 120, the first sub-section 1021 and the second sub-section 1022 of the first part 101 are separated, and then the samples to be tested are placed one by one into the multiple accommodating cavities 10 of the multiple first sub-sections 1021, and then the second sub-sections 1022 are covered to seal the accommodating cavities 10. The ratio of the volume of the sample to be tested to the volume of the accommodating cavity 10 is greater than or equal to 2/3 and less than or equal to 1.

In step 130, one accommodating cavity 10 is selected each time, and the test gas is introduced into the selected accommodating cavity to detect the sample to be tested in the selected accommodating cavity. After the detection is completed, the next accommodating cavity 10 is selected, and the test gas is introduced into the accommodating cavity 10 to detect the sample to be tested in the accommodating cavity 10. And so on, until all accommodating cavities 10 are selected. During the detection of the sample to be tested in the target accommodating cavity, the gas flow in the second connecting portion 1032 corresponding to the remaining accommodating cavities 10 is cut off.

Before the test gas in the reference chamber is delivered to the selected accommodating chamber, the multiple accommodating chambers 10 are placed in a constant temperature environment. The temperature of the constant temperature environment can be 25°C to 60°C.

During the period when the selected accommodating chamber forms a negative pressure, the selected accommodating chamber and the reference chamber are connected so that the test gas in the reference chamber is transported to the selected accommodating chamber. The accommodating chamber 10 may be subjected to 2 to 6 steps of evacuating and breaking the vacuum.

In step 140, the true volume of the sample to be tested may be obtained, and the porosity or true density of the sample to be tested may be obtained based on the true volume.

The method for obtaining the true volume includes: obtaining a first volume of a selected accommodating cavity; obtaining a second volume of the test gas in the selected accommodating cavity; and obtaining the true volume based on the difference between the first volume and the second volume.

The method for obtaining the second volume includes: obtaining the total volume of the test gas in the reference chamber and the selected containing chamber after the reference chamber and the selected containing chamber are connected, as the third volume; obtaining the fourth volume of the reference chamber; and obtaining the second volume based on the difference between the third volume and the fourth volume.

The method for obtaining the third volume includes: obtaining a first pressure before the reference chamber and the selected accommodating chamber are connected and the reference chamber is filled with test gas; obtaining a second pressure of the reference chamber after the reference chamber and the selected accommodating chamber are connected, and substituting the first pressure, the second pressure and the fourth volume into the following formula to calculate the third volume.

(3)

_V3 represents the third volume, _V4 represents the fourth volume, _P1 represents the first pressure, and _P2 represents the second pressure.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims (19)

1. A solid-state battery detection device characterized by comprising:

-a first portion (101), said first portion (101) having a reference chamber (11) therein, said reference chamber (11) being for loading a test gas;

A second portion (102) comprising:

a first sub-portion (1021), the first sub-portion (1021) having a plurality of receiving slots, the receiving slots having a top opening;

The second sub-part (1022) is arranged on the first sub-part (1021) and covers the top opening of the accommodating groove so as to form an accommodating cavity (10) with the accommodating groove, and the accommodating cavity (10) is used for accommodating a sample to be tested;

The solid-state battery detection device further includes:

And the communication part (103) is used for communicating the accommodating cavity (10) with the reference cavity (11) so that the test gas in the reference cavity (11) is conveyed to the corresponding accommodating cavity (10) through the communication part (103).

2. The solid-state battery detection device according to claim 1, wherein the communication portion (103) includes:

a first communication unit (1031), wherein a first end of the first communication unit (1031) communicates with the reference chamber (11);

A plurality of second communication parts (1032), the plurality of second communication parts (1032) are connected with the plurality of accommodating cavities (10) in a one-to-one correspondence manner, wherein,

One end of the second communicating part (1032) is communicated with the accommodating cavity (10), and the other end is communicated with the second end of the first communicating part (1031).

3. The solid-state battery detection device according to claim 1, wherein the communication portion (103) includes:

And a plurality of sub-communication parts (103 a), wherein each sub-communication part (103 a) is respectively connected with one accommodating cavity (10) and the reference cavity (11).

4. The solid-state battery detection device according to claim 1, wherein the communication portion (103) includes: the plurality of stopping pieces (104), the plurality of stopping pieces (104) are in one-to-one correspondence with the plurality of accommodating cavities (10), and the stopping pieces (104) are used for stopping the test gas from being introduced into the accommodating cavities (10) through the communicating parts (103).

5. The solid state battery detection device according to any one of claims 1-4, wherein the second portion (102) further comprises: and a sealing member (1023) located between the first sub-part (1021) and the second sub-part (1022) for sealing the top opening of the accommodating groove.

6. The solid-state battery detection device according to claim 5, wherein the first sub-section (1021) includes:

A plurality of accommodating structures (10 a), wherein each accommodating structure (10 a) is internally provided with the accommodating groove;

An annular groove (20), the annular groove (20) being arranged around the outer periphery of the accommodating structure (10 a); the seal (1023) comprises:

A top cover;

The extending part is arranged around the periphery of the top cover and connected with the top cover, the extending part extends into the annular groove (20), and the top cover seals the top opening of the accommodating groove.

7. The solid-state battery detection device according to claim 6, wherein the protruding portion is screwed with an inner surface of the first sub-portion (1021) for surrounding the annular groove (20).

8. The solid-state battery detection device according to claim 4, wherein the communication portion (103) communicates with the other end of the accommodation groove opposite to the top opening.

9. A battery production apparatus comprising the solid-state battery detection device according to any one of claims 1 to 8.

10. A solid-state battery detection method applied to the solid-state battery detection device according to any one of claims 1 to 8, comprising:

introducing a test gas into the reference chamber (11) of the first part (101);

placing a plurality of samples to be tested in a plurality of accommodating grooves of a first sub-part (1021) in a one-to-one correspondence manner, and enabling a second sub-part (1022) to cover the top opening of the accommodating groove so that the samples to be tested are positioned in the accommodating cavity (10);

Sequentially selecting a plurality of accommodating cavities (10), and communicating the selected accommodating cavities (10) with the reference cavity (11) so that test gas in the reference cavity (11) is conveyed into the selected accommodating cavities (10);

and testing the sample to be tested in the selected accommodating cavity (10).

11. The method according to claim 10, wherein said sequentially selecting said plurality of accommodation cavities (10) and communicating the selected accommodation cavity (10) with said reference cavity (11) comprises:

Selecting a target accommodating cavity;

and communicating the reference cavity (11) with the target accommodating cavity, and cutting off the communication between the rest of accommodating cavities (10) and the reference cavity (11).

12. The method according to claim 10, wherein said testing the sample to be tested in the selected containing cavity (10) comprises:

And obtaining the true volume of the sample to be detected, wherein the true volume is the volume of the sample to be detected minus the internal pore.

13. The method of claim 12, wherein obtaining the true volume of the sample to be measured comprises:

-acquiring a first volume of said selected containing cavity (10);

Acquiring a second volume of test gas within the selected accommodation chamber (10);

The true volume is acquired based on a difference between the first volume and the second volume.

14. The method of claim 13, wherein the method of acquiring the second volume comprises:

acquiring the total volume of the test gas in the reference cavity (11) and the selected accommodating cavity (10) as a third volume after the reference cavity (11) and the selected accommodating cavity (10) are communicated;

-acquiring a fourth volume of the reference chamber (11);

the second volume is acquired based on the difference of the third volume and the fourth volume.

15. Method according to claim 14, characterized in that the passage of the test gas into the reference chamber (11) is continued during the communication of the selected receiving chamber (10) with the reference chamber (11).

16. The method of claim 14 or 15, wherein the method of acquiring the third volume comprises:

acquiring a first pressure when the reference cavity (11) is full of the test gas before the reference cavity (11) is communicated with the selected accommodating cavity (10);

Acquiring a second pressure of the reference cavity (11) after the reference cavity (11) is communicated with the selected accommodating cavity (10);

the third volume is acquired based on the first pressure, the second pressure, and the fourth volume.

17. The method according to any one of claims 10 to 15, wherein placing the plurality of samples to be measured in the plurality of receiving cavities (10) of the second portion (102) in a one-to-one correspondence comprises: the ratio of the volume of the sample to be measured to the volume of the accommodating cavity (10) is greater than or equal to 2/3 and less than or equal to 1.

18. Method according to any one of claims 10-15, characterized in that the plurality of chambers (10) are subjected to a constant temperature environment before the test gas in the reference chamber (11) is delivered to the selected chamber (10).

19. Method according to any one of claims 10-15, characterized in that during the formation of the negative pressure in the selected accommodation chamber (10), the selected accommodation chamber (10) is communicated with the reference chamber (11) such that the test gas in the reference chamber (11) is conveyed into the selected accommodation chamber (10).