Testing device of liquid metal battery and assembling method of testing device

Abstract

The embodiment of the invention relates to the technical field of liquid metal batteries, in particular to a testing device of a liquid metal battery and an assembling method of the testing device. The test device comprises a transparent pipe fitting; the positive electrode lead and the negative electrode lead extend into the transparent pipe fitting from the two ends of the transparent pipe fitting respectively, and an area between the positive electrode lead and the negative electrode lead is used for accommodating a positive electrode material, a negative electrode material and an electrolyte material; the heating part forms a heating cavity, and the transparent pipe fitting is detachably mounted in the heating cavity, so that the transparent pipe fitting is heated by the heating part, and the positive electrode material, the negative electrode material and the electrolyte material in the transparent pipe fitting are all in a liquid state; and the heating piece further forms an observation channel communicated with the heating cavity, so that the interface among the positive electrode material, the negative electrode material and the electrolyte material of the transparent pipe fitting can be observed through the observation channel. According to the embodiment of the invention, imaging observation can be carried out on the discharge product of the three-layer liquid structure through the observation channel by utilizing the microscopic imaging device.

Description

Technical Field

[0001] The present application relates to the technical field of liquid metal batteries, and in particular to a test device for liquid metal batteries and an assembly method thereof. Background Art

[0002] The statements herein merely provide background information related to the present application and do not necessarily constitute prior art.

[0003] Liquid metal batteries can be divided into a positive electrode layer, a negative electrode layer and an electrolyte layer due to the different densities of the liquid metals they contain. The battery has the advantages of simple structure, easy enlargement, excellent rate performance and long cycle life.

[0004] There are some problems with current liquid metal batteries during testing. For example, since liquid metal batteries are usually three-layer all-liquid structures, the discharge products produced during the discharge process are mainly dispersed in the liquid phase and are difficult to separate and sample, so it is difficult to observe the discharge products. Summary of the invention

[0005] A brief overview of the present application is provided below in order to provide a basic understanding of certain aspects of the present application. It should be understood that this overview is not an exhaustive overview of the present application. It is not intended to identify the key or important parts of the present application, nor is it intended to limit the scope of the present application. Its purpose is merely to present certain concepts in a simplified form as a prelude to a more detailed description discussed later.

[0006] At present, the test device in the related technology can observe the interface between the positive electrode material and the negative electrode material and the electrolyte during the test. However, such a test device is only suitable for solid metal batteries, but not for liquid metal batteries with a three-layer all-liquid structure.

[0007] In view of the above problems, the embodiments of the present application provide a liquid metal battery test device and an assembly method thereof.

[0008] In the first aspect, an embodiment of the present application provides a test device for a liquid metal battery, comprising: a transparent tube; a positive electrode lead and a negative electrode lead, which extend from both ends of the transparent tube into the interior of the transparent tube respectively, and the area between the positive electrode lead and the negative electrode lead is used to accommodate positive electrode material, negative electrode material and electrolyte material; a heating element, the heating element forms a heating cavity, and the transparent tube is detachably installed in the heating cavity, so that the transparent tube is heated by the heating element, so that the positive electrode material, negative electrode material and electrolyte material in the transparent tube are all in liquid state; wherein the heating element also forms an observation channel connected to the heating cavity, so that the interface between the positive electrode material, negative electrode material and electrolyte material of the transparent tube can be observed through the observation channel.

[0009] In the embodiment of the present application, a transparent tube is provided to use the area between the positive and negative electrode leads to accommodate the positive electrode material, the negative electrode material and the electrolyte material, and the heating element is formed into a heating chamber and an observation channel connected to the heating chamber. In this way, the discharge products of the three-layer liquid structure can be imaged and observed through the observation channel using a microscopic imaging device, thereby realizing in-situ characterization of the positive and negative electrode products of any charging and discharging process.

[0010] In the second aspect, an embodiment of the present application also provides an assembly method for a test device of a liquid metal battery, comprising: S1, inserting a positive electrode lead into a transparent tube, and adding a solid block positive electrode material into the transparent tube; S2, heating the transparent tube to melt the positive electrode material into a liquid state; S3, after the liquid positive electrode material solidifies, adding an electrolyte material into the transparent tube; S4, adhering a solid block negative electrode material to the negative electrode lead, and then inserting the negative electrode lead from the upper end of the transparent tube downward into the transparent tube until part of the negative electrode material is located below the liquid surface of the electrolyte material.

[0011] These and other advantages of the present application will become more apparent through the following detailed description of the preferred embodiments of the present application in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to further illustrate the above and other advantages and features of the present application, the specific embodiments of the present application are further described in detail below in conjunction with the accompanying drawings. The accompanying drawings together with the following detailed description are included in this specification and form a part of this specification. Elements with the same function and structure are represented by the same reference numerals. It should be understood that these drawings only describe typical examples of the present application and should not be regarded as limiting the scope of the present application.

[0013] Figure 1 is a schematic structural diagram of a test device for a liquid metal battery according to an embodiment of the present application;

[0014] Figure 2 yes Figure 1 A schematic cross-sectional view of the test apparatus shown;

[0015] Figure 3 yes Figure 2 The test device shown is a cross-sectional schematic diagram after omitting the transparent tube, positive electrode lead and negative electrode lead;

[0016] Figure 4 yes Figure 2 A schematic cross-sectional view of the main structure of the test device shown;

[0017] Figure 5 yes Figure 4 A partial enlarged schematic diagram of the middle A area;

[0018] Figure 64 is a schematic cross-sectional view of an insulating positioning member according to an embodiment of the present application.

[0019] It should be noted that the drawings are not necessarily drawn to scale, but are merely shown in a schematic manner that does not affect the reader's understanding.

[0020] Description of reference numerals:

[0021] 10. Heating chamber; 11. Shell body; 111. Heat conducting member; 12. Shell cover; 121. Observation channel; 122. Threaded hole; 13. Mounting member; 14. Mounting fitting; 15. Fitting member; 16. Sealing member; 17. Post; 21. Transparent pipe; 22. Positive electrode lead; 23. Negative electrode lead; 231. Exhaust channel; 232. Joint; 24. Insulating positioning member; 241. Arc surface; 242. Plane; 25. Temperature measuring member; 26. Sealing member; 271. Exhaust pipe; 272. Exhaust valve; 30. Positive electrode material; 40. Electrolyte material; 50. Negative electrode material. DETAILED DESCRIPTION

[0022] Exemplary embodiments of the present application will be described below in conjunction with the accompanying drawings. For the sake of clarity and conciseness, not all features of the actual implementation are described in the specification. However, it should be understood that many implementation-specific decisions must be made in the process of developing any such actual implementation in order to achieve the developer's specific goals, such as meeting those constraints related to the system and business, and these constraints may vary from implementation to implementation. In addition, it should be understood that although the development work may be very complex and time-consuming, it is only a routine task for those skilled in the art who benefit from the content of this application.

[0023] It is also necessary to explain here that, in order to avoid obscuring the present application due to unnecessary details, only the device structure and / or processing steps closely related to the scheme according to the present application are shown in the accompanying drawings, while other details that are not very relevant to the present application are omitted.

[0024] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in this application should have the common meanings understood by persons with ordinary skills in the field to which this application belongs.

[0025] In the description of the embodiments of the present application, “plurality” means at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0026] Figure 1 is a schematic structural diagram of a test device for a liquid metal battery according to an embodiment of the present application; Figure 2 yes Figure 1 A schematic cross-sectional view of the test apparatus shown; Figure 3 yes Figure 2 The cross-sectional schematic diagram of the test device shown in the figure omits the transparent tube, positive electrode lead and negative electrode lead. Figures 1 to 3 As shown, the test device of the embodiment of the present application may include: a transparent tube 21, a positive electrode lead 22 and a negative electrode lead 23, and a heating element. The positive electrode lead 22 and the negative electrode lead 23 extend from both ends of the transparent tube 21 into the interior of the transparent tube 21, respectively, and the area between the positive electrode lead 22 and the negative electrode lead 23 is used to accommodate the positive electrode material, the negative electrode material and the electrolyte material. The heating element forms a heating chamber 10, and the transparent tube 21 is detachably mounted on the heating chamber 10, so that the transparent tube 21 is heated by the heating element, so that the positive electrode material, the negative electrode material and the electrolyte material in the transparent tube 21 are all in a liquid state. Among them, the heating element also forms an observation channel 121 connected to the heating chamber 10, so that the interface between the positive electrode material, the negative electrode material and the electrolyte material of the transparent tube 21 can be observed through the observation channel 121.

[0027] In the embodiment of the present application, a transparent tube 21 is provided, and the area between the positive and negative electrode leads 23 is used to accommodate the positive electrode material, the negative electrode material and the electrolyte material, and the heating element forms a heating chamber 10 and an observation channel 121 connected to the heating chamber 10. In this way, the discharge products of the three-layer liquid structure can be imaged and observed through the observation channel 121 using a microscopic imaging device, thereby realizing in-situ characterization of the positive and negative electrode products of any charging and discharging process.

[0028] In some embodiments, there is a gap fit between the positive electrode lead 22 and the negative electrode lead 23 and the transparent tube 21. In this way, the gas in the space between the positive electrode lead 22 and the negative electrode lead 23 can enter the gap between the positive electrode lead 22 and the negative electrode lead 23 and the transparent tube 21, and then be discharged outward; while the positive electrode material, the negative electrode material and the electrolyte material in liquid state will not enter the gap due to the effect of surface tension.

[0029] In some embodiments, the test device further includes a plurality of seals 26 disposed between the positive electrode lead 22 or the negative electrode lead 23 and the transparent tube 21 , and used to seal the positive electrode lead 22 or the negative electrode lead 23 and the transparent tube 21 .

[0030] In some embodiments, the sealing member 26 may be a rubber ring, such as a fluororubber ring. In some embodiments, the transparent tube 21 may be a quartz tube.

[0031] In some embodiments, see Figure 4 and Figure 5The test device further includes: an insulating positioning member 24, which is used to be movably disposed in the transparent tube 21 above the positive electrode material 30 after the positive electrode material 30 is filled in the transparent tube 21. A gap is formed between the circumferential surface of the insulating positioning member 24 and the tube wall of the transparent tube 21 for filling the electrolyte material 40.

[0032] The inventors of the present application found that in the process of assembling the test device, after the positive electrode lead 22 and the transparent tube 21 are assembled, the solid block positive electrode material 30 is first filled, and then the transparent tube 21 is heated to melt the positive electrode material 30. After the positive electrode material 30 solidifies (the positive electrode material 30 is "flattened" through the melting and solidification process), the electrolyte is filled, and finally the solid block negative electrode material 50 is adhered to the negative electrode lead 23, and then the negative electrode lead 23 is extended downward from the upper end of the transparent tube 21 into the transparent tube 21. In this process, it is necessary to pay attention to the length of the negative electrode material 50 immersed in the electrolyte, so as to ensure that the negative electrode material 50 is in contact with the electrolyte and that the negative electrode material 50 cannot be in contact with the positive electrode material 30; however, since the thickness of the electrolyte is relatively thin, for example, 1-2 mm, this makes the above operation more difficult. The embodiment of the present application specifically provides an insulating positioning piece 24. After the positive electrode material 30 is melted and solidified, the insulating positioning piece 24 is added to the transparent tube 21, and then the electrolyte is filled in the gap formed between the circumferential surface of the transparent tube 21 and the tube wall of the transparent tube 21. Then, the negative electrode lead 23 adhered with the solid block negative electrode material 50 is extended downward from the upper end of the transparent tube 21 into the transparent tube 21 until it abuts against the insulating positioning piece 24, and the assembly of the liquid metal battery is completed.

[0033] It is easy to understand that the insulating positioning member 24 in the embodiment of the present application is different from the diaphragm in the liquid metal battery. The diaphragm is usually an insulating porous membrane (such as glass fiber filter paper) with a thickness of several microns, which is used to adsorb the electrolyte and at the same time insulate the positive electrode material 30 and the negative electrode material 50. The insulating positioning member 24 in the embodiment of the present application is used to position the negative electrode lead 23 downward in the transparent tube 21, and the spacing between the insulating positioning member 24 and the tube wall of the transparent tube 21 forms a storage space for accommodating the electrolyte material 40, and the insulating positioning member 24 also serves to insulate the positive electrode material 30 and the negative electrode material 50.

[0034] In the embodiment of the present application, when conducting an experiment, the transparent tube 21, the positive electrode lead 22, the negative electrode lead 23, the seal 26, the insulating positioning member 24 arranged in the transparent tube 21, the positive electrode material 30, the electrolyte material 40 and the negative electrode material 50 together constitute a liquid metal battery.

[0035] In some embodiments, the insulating spacer 24 can be made of plastic. In some embodiments, the insulating spacer 24 can be made of polyetheretherketone (peek).

[0036] It is easy to understand that since the space between the insulating spacer 24 and the wall of the transparent tube 21 forms a space for accommodating the electrolyte material 40, the thickness and cross-sectional area of ​​the insulating spacer 24 are related to the content of the electrolyte material 40. In some embodiments, the thickness of the insulating spacer 24 is 1-2 mm.

[0037] The insulating spacer 24 and the electrolyte are both located between the positive electrode material 30 and the negative electrode material 50. The density of the insulating spacer 24 is greater than that of the negative electrode material 50 and less than that of the positive electrode material 30, so that the insulating spacer 24 can be located between the positive electrode material 30 and the negative electrode material 50.

[0038] In some embodiments, the cross section of the transparent tube 21 is circular. Figure 6 The circumferential surface of the insulating positioning member 24 includes an arc surface 241 matching the shape of the transparent tube 21 and a plane 242 connected to the arc surface 241, and a gap is formed between the plane 242 and the tube wall of the transparent tube 21. In such an embodiment, it is beneficial to make one side of the arc surface 241 of the insulating positioning member 24 contact the tube wall of the transparent tube 21, and one side of the plane 242 forms a gap with the tube wall of the transparent tube 21.

[0039] In some embodiments, the circular angle corresponding to the arc surface 241 is greater than 180 degrees, so as to prevent the insulating positioning member 24 from shaking in the transparent tube 21 .

[0040] Since a common microscopic imaging device can only penetrate 1-2 mm of electrolyte, the interval between the plane 242 and the tube wall of the transparent tube 21 can be greater than 2 mm.

[0041] In some embodiments, the heating element includes: a shell body 11, a heat conductive member 111, an electric heating element and a shell cover 12. The heat conductive member 111 is disposed on the shell body 11, and the electric heating element is disposed on the heat conductive member 111. The heat conductive member 111 forms a first recessed portion. The shell cover 12 is detachably connected to the shell body 11, and the shell cover 12 forms a second recessed portion facing the first recessed portion, and the first recessed portion and the second recessed portion jointly form a heating chamber 10. An observation channel 121 is disposed on the shell cover 12. In such an embodiment, it is convenient to assemble the transparent tube 21, the positive lead 22, and the negative lead 23 with the heating element.

[0042] In some embodiments, the test device further includes: two mounting members 13 and two mounting fittings 14. The two mounting members 13 are connected to the shell cover 12, and the transparent tube 21 is disposed between the two mounting members 13; the two mounting fittings 14 are respectively connected to the positive lead 22 and the negative lead 23, and each mounting fitting 14 is detachably connected to a corresponding mounting member 13 to mount the positive lead 22, the negative lead 23 and the transparent tube 21 on the shell cover 12.

[0043] In such an embodiment, the transparent tube 21 can be placed between the two mounting members 13 of the shell cover 12 in the glove box, the mounting fitting 14 and the plurality of sealing members 26 can be sleeved on the positive lead 22, and then the positive lead 22 is inserted into the transparent tube 21 through the lower mounting member 13, and the mounting fitting 14 is connected to the mounting member 13, and then the positive electrode material 30, the insulating positioning member 24, and the electrolyte material 40 are sequentially placed in the transparent tube 21, and another mounting fitting 14 and the plurality of sealing members 26 are sleeved on the negative electrode lead 23, and the negative electrode material 50 is adhered to the negative electrode lead 23, and then the negative electrode lead 23 is inserted into the transparent tube 21 through the upper mounting member 13 to abut against the insulating positioning member 24, and the mounting fitting 14 is connected to the mounting member 13. After that, the assembled structure is taken out of the glove box and assembled with the shell body 11. It can be seen that the above structure of the experimental device of the embodiment of the present application enables the liquid metal battery and the shell cover 12 to be quickly assembled in the glove box, and then the liquid metal battery and the shell cover 12 are taken out of the glove box and assembled with the shell body 11.

[0044] In some embodiments, when the shell cover 12 is connected to the shell body 11, the mounting member 13 is in contact with the shell body 11. The mounting member 13 and the mounting fitting 14 are equivalent to closing both ends of the heating chamber 10. In some embodiments, a sealing member 16 may be provided between the mounting member 13 and the mounting fitting 14 to seal the positive lead 22 or the negative lead 23 and the mounting member 13, that is, to seal the heating chamber 10.

[0045] In some embodiments, the mounting member 13 and the mounting fitting 14 are made of insulating material to insulate the positive electrode lead 22 and the negative electrode lead 23 from the case body 11 and the case cover 12 .

[0046] In some embodiments, the mounting member 13 and the mounting fitting member 14 are both provided with through holes for the positive electrode lead 22 or the negative electrode lead 23 to pass through. The mounting member 13 and the mounting fitting member 14 may be threadedly matched. In some embodiments, the mounting member 13 and the mounting fitting member 14 may be sealing rings made of PEEK.

[0047] In some embodiments, the positive electrode material 30 may be a liquid lead-bismuth alloy, and the negative electrode material 50 may be liquid sodium. In some embodiments, the electrolyte may be a sodium salt dissolved in an organic solvent. In some embodiments, the electrolyte may be 20:90 (mol%) sodium bis(fluorosulfonyl)imide:1-ethyl-3-methylimidazolium bis(fluorosulfonyl)imide (NaFSA: [EMim][FSA]).

[0048] In some embodiments, the positive lead 22 and the negative lead 23 may be stainless steel rods.

[0049] In some embodiments, the test device further includes an exhaust pipe 271 and an exhaust valve 272 disposed on the exhaust pipe 271. An exhaust channel 231 and an exhaust hole connecting the exhaust channel 231 and the gap between the negative lead 23 and the tube wall of the transparent tube 21 are formed inside the negative lead 23, and the gas in the transparent tube 21 can be discharged to the exhaust pipe 271 from the exhaust hole and the exhaust channel 231.

[0050] In some embodiments, the negative lead 23 includes a connector 232 , and the exhaust pipe 271 is connected to the connector 232 .

[0051] In some embodiments, the test device further includes a temperature measuring component 25 disposed on the negative electrode lead 23 . The temperature measuring component 25 enters the exhaust passage 231 and is used to measure the temperature of the transparent tube 21 .

[0052] In some embodiments, the test device further comprises two fittings 15, which are disposed on the shell body 11. The shell cover 12 can be detachably connected to the fittings 15 by fasteners, so that the transparent tube 21 is installed in the heating chamber 10.

[0053] In some embodiments, the fitting 15 forms a third recessed portion identical to the first recessed portion, and two fittings 15 are respectively formed on both sides of the first recessed portion formed by the heat conducting member 111, facing the second recessed portion of the shell cover 12. When the shell cover 12 is detachably connected to the fitting 15 by a fastener, the two fittings 15 are respectively adjacent to the mounting members 13 in the area between the two mounting members 13. In some embodiments, the fitting 15 may have a semicircular arc structure. The fitting 15 may be made of corundum.

[0054] In some embodiments, the shell cover 12 is provided with a plurality of threaded holes 122, and each mating piece 15 is correspondingly provided with a plurality of threaded holes, and the shell cover 12 is connected to the mating piece 15 by a threaded fastener. In such an embodiment, when the threaded fastener is removed, the shell cover 12 and the liquid metal battery are separated from the shell body 11.

[0055] In some embodiments, the shell cover 12 and the shell cover 12 are made of aluminum alloy.

[0056] In some embodiments, the test device further includes a column 17 for supporting the heating element as a whole so that the transparent tube 21 can be in an upright state. This allows the microscopic imaging device to perform in-situ microscopic imaging from a side view. The experimental device of the embodiment of the present application can achieve heating and charging and discharging of the liquid metal battery without affecting in-situ microscopic observation.

[0057] The embodiment of the present application also provides a method for assembling a test device for a liquid metal battery. The test device can be the test device of any embodiment of the present application. The assembly method includes steps S1 to S4.

[0058] S1 . Insert the positive electrode lead 22 into the transparent tube 21 , and add the solid block positive electrode material 30 into the transparent tube 21 .

[0059] S2. Heat the transparent tube 21 to melt the positive electrode material 30 into a liquid state.

[0060] S3 . After the liquid positive electrode material 30 solidifies, the electrolyte material 40 is added into the transparent tube 21 .

[0061] S4. Adhere the solid block negative electrode material 50 to the negative electrode lead 23, and then insert the negative electrode lead 23 from the upper end of the transparent tube 21 downward into the transparent tube 21 until part of the negative electrode material 50 is located below the liquid surface of the electrolyte material 40.

[0062] In some embodiments, step S3 includes: S31, after the liquid positive electrode material 30 solidifies, adding an insulating positioning piece 24 to the transparent tube 21; S32, adding an electrolyte material 40 to the gap between the circumferential surface of the insulating positioning piece 24 and the tube wall of the transparent tube 21 until the liquid level of the electrolyte material 40 reaches the upper surface of the insulating positioning piece 24.

[0063] In step S4 , the negative electrode lead 23 adhered to the solid block negative electrode material 50 is inserted downwardly into the transparent tube 21 from the upper end thereof until the solid block negative electrode material 50 abuts against the insulating positioning member 24 .

[0064] The above steps S1-S4 can all be performed in a glove box.

[0065] In some embodiments, the assembly method further includes S5: rotating the transparent tube 21 so that the electrolyte material 40 in the transparent tube 21 faces the observation channel 121 of the heating element.

[0066] In some embodiments, the step of sealing the positive electrode material 30, the negative electrode material 50 and the electrolyte material 40 in the transparent tube 21 of the embodiment of the present application can be carried out in a glove box filled with inert gas and with the water and oxygen content below 1 μg / g to prevent the performance of the liquid metal battery from deteriorating due to oxidation corrosion of the positive electrode material 30 and the negative electrode material 50.

[0067] For ease of description and understanding, the following describes in detail the assembly method of the test device of the embodiment of the present application, taking a liquid metal battery in which the positive electrode material 30 is a lead-bismuth alloy, the negative electrode material 50 is sodium, and the electrolyte is a 20:90 (mol%) sodium bis(fluorosulfonyl)imide:1-ethyl-3-methylimidazole bis(fluorosulfonyl)imide (NaFSA: [EMim][FSA]) liquid metal battery as an example.

[0068] Preparation steps: (1) Treatment of lead-bismuth alloy: Before placing the lead-bismuth alloy in a transparent container, a stainless steel spoon can be used to remove floating impurities on the surface of the lead-bismuth alloy to prevent the impurities from affecting the battery performance. (2) Treatment of sodium: Before placing the sodium in a transparent container, a stainless steel wire mesh can be used to remove floating oxides on the surface of the sodium. (3) Treatment of electrolyte: Dry sodium bis(trifluoromethanesulfonyl)imide in an oven at a temperature in the range of 85-95°C for 3 hours; use a molecular sieve to remove moisture from the 1-ethyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide solvent, add the dried sodium bis(trifluoromethanesulfonyl)imide to the 1-ethyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide solvent and heat it to 80°C so that the sodium bis(trifluoromethanesulfonyl)imide can dissolve to form an electrolyte.

[0069] Assembly steps: In the glove box, first place the transparent tube 21 between the two mounting pieces 13 of the shell cover 12, sleeve the mounting fitting 14 and multiple sealing pieces 26 on the positive electrode lead 22, then insert the positive electrode lead 22 into the transparent tube 21 through the mounting piece 13 below, connect the mounting fitting 14 with the mounting piece 13, and then put the solid block positive electrode material 30 into the transparent tube 21, then use a hot air gun to heat the transparent tube 21 to melt the positive electrode material 30, and then wait for the positive electrode material 30 to melt at room temperature. After the electrode material 30 solidifies, an insulating positioning piece 24 is added to the transparent tube 21, and then the electrolyte is filled in the gap formed between the circumferential surface of the transparent tube 21 and the tube wall of the transparent tube 21, and then another mounting fitting 14 and a plurality of sealing pieces 26 are sleeved on the negative electrode lead 23, and the negative electrode material 50 is adhered to the negative electrode lead 23, and then the negative electrode lead 23 is inserted into the transparent tube 21 through the upper mounting piece 13 to abut against the insulating positioning piece 24, and the mounting fitting 14 is connected to the mounting piece 13. After that, the assembled structure is taken out of the glove box, and the transparent tube 21 is rotated so that the electrolyte material 40 in the transparent tube 21 faces the observation channel 121 of the heating element, and the transparent tube 21 is placed in the first recessed portion and the third recessed portion of the shell body 11, and the shell cover 12 is assembled with the fitting.

[0070] Afterwards, the liquid metal battery can be heated to 150° C. by using a heating element. After heating for 2 hours, the liquid metal battery can be subjected to a battery charge and discharge test. During any charge and discharge process, the positive and negative electrode interfaces of the liquid metal battery can be directly observed through the observation channel 121 by using a microscopic imaging device, which is very convenient.

[0071] Regarding the embodiments of the present application, it should also be noted that, in the absence of conflict, the embodiments of the present application and the features therein can be combined with each other to obtain new embodiments.

[0072] The above description is only a specific implementation manner of the present application, but the protection scope of the present application is not limited thereto. The protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. A liquid metal battery test device, characterized in that: include: Transparent pipe fittings; A positive electrode lead and a negative electrode lead are respectively extended from both ends of the transparent tube into the interior of the transparent tube, and the area between the positive electrode lead and the negative electrode lead is used to accommodate positive electrode material, negative electrode material and electrolyte material; A heating element, wherein the heating element forms a heating cavity, and the transparent tube is detachably mounted in the heating cavity, so that the transparent tube is heated by the heating element, so that the positive electrode material, the negative electrode material and the electrolyte material in the transparent tube are all in a liquid state; Wherein, the heating element also forms an observation channel connected to the heating chamber, so that the interface between the positive electrode material, the negative electrode material and the electrolyte material of the transparent tube can be observed through the observation channel.

2. The test device according to claim 1, characterized in that: The positive electrode lead and / or the negative electrode lead are / is clearance-fitted with the transparent tube.

3. The test device according to claim 2, characterized in that: It also includes a plurality of sealing members, which are arranged between the positive electrode lead or the negative electrode lead and the transparent tube member and are used to seal the positive electrode lead or the negative electrode lead and the transparent tube member.

4. The test device according to claim 1, characterized in that: Also includes: An insulating positioning member, the insulating positioning member is used to be movably arranged in the transparent tube above the positive electrode material after the positive electrode material is filled in the transparent tube; A gap is formed between the circumferential surface of the insulating positioning member and the tube wall of the transparent tube member for filling the electrolyte material.

5. The test device according to claim 4, characterized in that: The density of the insulating positioning piece is less than the density of the positive electrode material, and greater than the density of the negative electrode material.

6. The test device according to claim 4, characterized in that: The circumferential surface of the insulating positioning piece includes an arc surface matching the shape of the transparent tube and a plane connected to the arc surface, and the interval is formed between the plane and the tube wall of the transparent tube.

7. The test device according to claim 1, characterized in that: The heating element comprises: Shell body; A heat conducting member, disposed on the shell body, wherein the heat conducting member forms a first recessed portion; An electric heating element, arranged on the heat conducting member; a shell cover body, detachably connected to the shell body, the shell cover body forming a second recessed portion facing the first recessed portion, the first recessed portion and the second recessed portion jointly forming the heating chamber; The observation channel is arranged on the shell cover.

8. The test device according to claim 7, characterized in that: Also includes: Two mounting members, the two mounting members are connected to the shell cover; The transparent tube is arranged between the two mounting parts; Two mounting fittings are connected to the positive electrode lead and the negative electrode lead respectively, and each mounting fitting is detachably connected to a corresponding mounting fitting to mount the positive electrode lead, the negative electrode lead and the transparent tube on the shell cover.

9. A method for assembling a test device for a liquid metal battery as claimed in any one of claims 1 to 8, characterized in that: The assembly method comprises: S1, inserting the positive electrode lead into the transparent tube, and adding solid block positive electrode material into the transparent tube; S2, heating the transparent tube to melt the positive electrode material into a liquid state; S3, after the liquid positive electrode material solidifies, adding the electrolyte material into the transparent tube; S4. Adhere the solid block negative electrode material to the negative electrode lead, and then insert the negative electrode lead from the upper end of the transparent tube downward into the transparent tube until the negative electrode material is partially located below the liquid surface of the electrolyte material.

10. The assembly method according to claim 9, characterized in that: The S3 step includes: S31, after the liquid positive electrode material solidifies, adding an insulating positioning piece into the transparent tube; S32, adding electrolyte material to the gap between the circumferential surface of the insulating positioning member and the tube wall of the transparent tube member until the liquid level of the electrolyte material reaches the upper surface of the insulating positioning member; In the step S4, the negative electrode lead adhered to the solid block negative electrode material is inserted downwardly into the transparent tube from the upper end of the transparent tube until the solid block negative electrode material abuts against the insulating positioning member.

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