External tab and lithium battery in-situ working condition reaction observation device with same

Abstract

The external tab and the lithium battery in-situ working condition reaction observation device with the external tab comprise a first conduction piece, a second conduction piece, an insulation piece and a threaded flange, one of the first conduction piece and the second conduction piece is provided with a groove, the other one of the first conduction piece and the second conduction piece is provided with a convex part which is connected with the groove in an inserted mode, and the first conduction piece and the second conduction piece are connected through the threaded flange. The first conduction piece is matched with the second conduction piece in an inserted mode, at least part of the second conduction piece is arranged in the insulation piece, the second conduction piece makes contact with the inner wall of the insulation piece in a sealed sintering mode, the insulation piece is arranged in the threaded flange, and the outer wall of the insulation piece makes contact with the inner wall of the threaded flange in a sealed sintering mode. The first conduction piece and the second conduction piece are arranged in a conductive mode after being connected in an inserted mode. The device has the advantages of high reliability, high structural strength, high air tightness, long-time use stability, repeated use and the like, side reactions can be effectively avoided, and an important guarantee is provided for in-situ observation of the lithium battery.

Description

TECHNICAL FIELD

[0001] The utility model relates to material testing technical field, concretely relates to a kind of external tab and the observation device of lithium battery in-situ working condition reaction with it. BACKGROUND

[0002] Lithium battery has been widely used in travel traffic, digital consumption, equipment energy storage, intelligent wear, equipment power supply and other various production and life fields due to its advantages such as high energy density, long cycle life, green recyclability, low manufacturing cost and diversity of material system and battery structure design. With the help of material synthesis innovation and battery manufacturing technology progress, the overall performance of lithium battery is systematically improved. With the wide application of lithium battery, the development of advanced characterization technology and the revolution of new energy technology, people have higher requirements for battery consistency, safety performance, energy density, cycle stability and environmental adaptability, and the research on battery system micro-reaction mechanism and battery failure has also been highly valued by the industry and academia.

[0003] Since lithium battery is a special "three-trans and one-reaction" reactor involving ion transmission, electron conduction, heat transfer and electrochemical reaction, in-situ study of the physicochemical characteristic changes of battery and its key materials during charging and discharging by using advanced characterization technology is crucial for material synthesis analysis, battery failure analysis and battery manufacturing technology revolution. Currently, there are various in-situ characterization technology platforms that are equipped with specific in-situ devices, which have made in-depth research on the above key areas at the level of nanomaterials and macro-batteries. However, due to the difficulty in battery sample preparation and the need for special design of in-situ reaction device, there is little research on battery electrodes and battery in-situ reaction during the life cycle of battery. The current in-situ reaction device for lithium battery reaction contains a large amount of organic solvents that are easily volatile, and it is sealed by using conventional rubber seals and related designs. Under long-term exposure to air environment, the volatile electrolyte will cause the seal ring to swell, resulting in that most in-situ reaction devices cannot be used for long-term charging and discharging research. Under this background, it is necessary to build an in-situ reaction device with long-term air-tightness for lithium battery to study its structural changes, gas generation mechanism, battery failure and electrode reaction during charging and discharging. Therefore, it is necessary to design an in-situ reaction device with long-term air-tightness, and a key part of the air-tightness of the device is an external tab with good air-tightness. SUMMARY

[0004] The technical problem to be solved by the utility model is to provide an external tab with good air-tightness.

[0005] To solve the above technical problems, the first technical solution adopted by the utility model is:

[0006] An external lug includes a first conducting member, a second conducting member, an insulating member, and a threaded flange, wherein one of the first conducting member and the second conducting member is provided with a groove, and the other is provided with a protrusion inserted into the groove, the first conducting member and the second conducting member are inserted and matched, the second conducting member is at least partially arranged in the insulating member, the second conducting member and the inner wall of the insulating member are in sealed sintering contact, the insulating member is arranged in the threaded flange, and the outer wall of the insulating member and the inner wall of the threaded flange are in sealed sintering contact, and the first conducting member and the second conducting member are arranged in electrical conduction after being inserted.

[0007] In an embodiment, the groove is provided with an internal thread, and the protrusion is provided with an external thread matched with the internal thread.

[0008] In an embodiment, the second conducting member has a first end and a second end along the length direction, the second end is the protrusion, and the first end is used for conducting with an electrode.

[0009] In an embodiment, the second conducting member further has a sealing part arranged between the first end and the second end, and the sealing part is in sealed sintering contact with the inner wall of the insulating member.

[0010] In an embodiment, the first end, the second end, and the sealing part are all circular in cross section, and the cross-sectional diameter of the sealing part is greater than the cross-sectional diameters of the first end and the second end.

[0011] In an embodiment, the insulating member is internally hollow, the internal part of the insulating member is provided with a narrow part accommodating the second end and a wide part accommodating the sealing part, a resisting wall is arranged between the narrow part and the wide part, and the sealing part is in resisting cooperation with the resisting wall.

[0012] In an embodiment, the internal part of the insulating member is internally hollow, the internal part of the insulating member is provided with an internal thread, and the sealing part is externally provided with a thread structure matched with the internal thread.

[0013] In an embodiment, the second conducting member further includes a contact part in the shape of a hemisphere, the contact part is arranged at the second end, and the arched surface of the contact part is used for conducting with the electrode.

[0014] In an embodiment, the threaded flange is further provided with a clamping groove, and the clamping groove is used for arranging a sealing ring.

[0015] In an embodiment, the first conducting member is made of stainless steel, the second conducting member is made of stainless steel, the insulating member is made of ceramic, and the threaded flange is made of stainless steel.

[0016] To solve the above technical problems, the second technical scheme of the utility model adopts:

[0017] A kind of lithium battery in situ working condition reaction observation device, comprising:

[0018] Hollow shell, the upper portion of the hollow shell is provided with shell opening;

[0019] Observation cover, which is arranged on the shell opening, the observation cover has a transparent observation window;

[0020] Battery placement device, the battery placement device is used to hold lithium battery cross section block, the battery placement device includes inner tab that connects the lithium battery cross section block electrode;

[0021] External tab, as described above, the outer shell side is provided with a clearance hole, the external tab is connected with the inner tab through the clearance hole

[0022] Due to the above technical scheme, the utility model has the following advantages compared with the prior art:

[0023] The utility model discloses an external tab, including first conducting part, second conducting part, insulating part and threaded flange, by second conducting part and insulating part inner wall sealing sintering contact, insulating piece outer wall and threaded flange inner wall sealing sintering contact reach the excellent airtightness of external tab, integration, firmness and other performance, it can be sealed with lithium battery in situ working condition reaction observation device through sealing ring in use, finally realizes the excellent airtightness of whole lithium battery in situ working condition reaction observation device, helps the reaction mechanism research under the long time test of lithium battery in situ battery research. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 It is the external tab three-dimensional schematic view in an embodiment of the utility model;

[0025] Figure 2 It is the external tab explosion view in an embodiment of the utility model;

[0026] Figure 3 It is the external tab front view in an embodiment of the utility model;

[0027] Figure 4 It is the external tab sectional view in an embodiment of the utility model;

[0028] Figure 5 It is the front view of lithium battery in situ working condition reaction observation device in an embodiment of the utility model;

[0029] Figure 6The utility model discloses a lithium battery in situ working condition reaction observation device section view for one embodiment in the utility model;

[0030] Figure 7 The utility model discloses a lithium battery in situ working condition reaction observation device front view for having the contrast example;

[0031] Figure 8 The utility model discloses a lithium battery in situ working condition reaction observation device section view for having the contrast example;

[0032] Figure 9 It is the charge and discharge cycle capacity graph of the test result in the lithium battery in situ working condition reaction observation device of the external connection tab in one embodiment in the utility model;

[0033] Figure 10 It is the charge and discharge cycle coulomb efficiency graph of the test result in the lithium battery in situ working condition reaction observation device of the external connection tab in one embodiment in the utility model.

[0034] Figure 11 It is the first week coulomb efficiency graph of the test result in the lithium battery in situ working condition reaction observation device of the external connection tab in one embodiment in the utility model.

[0035] In the drawing:

[0036] 1-first conducting part;2-second conducting part;22-first end (convex part);23-second end;24-sealing part;25-contact part;3-insulating part;31-narrow part;32-wide part;4-threaded flange;41-inner connecting part;42-outer ring;43-clamping groove;5-sealing ring;6-outer shell;7-observation cover;8-battery placing device;9-external connection tab;10-conventional tab;11-irregular stud;12-hollow bolt. Specific implementation

[0037] The utility model is further described below in combination with the drawings and specific embodiments:

[0038] Embodiment 1

[0039] As Figures 1-6 The utility model provides a external connection tab, and the external connection tab includes first conducting part 1, second conducting part 2, insulating part 3 and threaded flange 4, wherein:

[0040] The first conducting part 1 and the second conducting part 2 are inserted and matched, in other embodiments, the recess is provided with an internal thread, and the convex part 22 is provided with an external thread matched with the internal thread, in the embodiment, the internal thread and the external thread are not provided, the first conducting part 1 is in the shape of a long cylinder, and the inside of the first conducting part 1 is provided with the recess, the second conducting part 2 has a first end part 22 and a second end part 23 along the length direction, the second end part 23 is the convex part, and the first end part 22 is used for conducting with the electrode and further conducting with the lithium battery cross section block in the observation device reacting with the lithium battery in situ, the second conducting part 2 further comprises a contact part 25 in the shape of a hemisphere, the contact part 25 is arranged at the second end part 23, and the arched surface of the contact part 25 is used for conducting with the electrode, and the first conducting part 1 and the second conducting part 2 are arranged to be conductive after being inserted and matched.

[0041] The second conducting part 2 further has a sealing part 24 arranged between the first end part 22 and the second end part 23, the first end part 22, the second end part 23 and the sealing part 24 are all circular in cross section, the cross section diameter of the sealing part 24 is greater than the cross section diameter of the first end part 22 and the cross section diameter of the second end part 23, and the cross section area of the first end part 22 is greater than the cross section area of the second end part 23.

[0042] The insulating part 3 is in the shape of a long cylinder, the inside of the insulating part 3 is hollow, and the two ends along the length direction of the insulating part 3 are not closed, so as to insert the second conducting part 2, and the second conducting part 2 is at least partially arranged in the insulating part 3, specifically, in other embodiments, the inside of the insulating part 3 is provided with a narrow part 31 accommodating the first end part 22 and a wide part 32 accommodating the sealing part 24, a resisting wall (not shown in the figure) is arranged between the narrow part and the wide part, the sealing part 24 is matched with the resisting wall to prevent the second conducting part 2 from being pulled out of the insulating part. Figure 2 、 4 As shown in the figure, in the embodiment, the sealing part 24 is further provided with a threaded structure, the inside of the insulating part 3 is no longer divided into the wide part and the narrow part, and the inside of the insulating part 3 is provided with an internal thread matched with the threaded structure, so that the connection between the sealing part 24 and the insulating part 3 is firm.

[0043] The threaded flange 4 is circular in cross section, and comprises an inner connecting part 41 provided with a thread and an outer ring 42 arranged outside the inner connecting part 41, the inner connecting part 41 is used for being screwed and connected with the outer shell 6 of the observation device reacting with the lithium battery in situ, a clamping groove 43 is arranged between the outer ring 42 and the inner connecting part 41, and the clamping groove 43 is used for arranging the sealing ring 5, and the sealing ring 5 can be a polytetrafluoroethylene O-ring.

[0044] The outer wall of the sealing part 24 of the second conducting part 2 is in sealing sintering contact with the inner wall of the insulation part 3, specifically, in other embodiments, the outer wall of the sealing part 24 of the second conducting part 2 is in sealing sintering contact with the inner wall of the wide part 32 of the insulation part 3, in the present embodiment, the threaded structure of the sealing part 24 of the second conducting part 2 is in sealing sintering contact with the internal thread of the insulation part 3, the outer wall of the insulation part 3 is in sealing sintering contact with the inner wall of the threaded flange 4, specifically, the sealing sintering contact can be realized by a high-temperature sintering annealing process, so that the first conducting part 1, the second conducting part 2, the insulation part and the threaded flange 4 are integrally arranged. The material of the first conducting part 1 is stainless steel, the material of the second conducting part 2 is stainless steel, the material of the insulation part is ceramic, and the material of the threaded flange 4 is stainless steel.

[0045] As shown in Figures 5-6 The utility model discloses a lithium battery in situ working condition reaction's observation device includes shell body 6, observation cover 7, battery placing device 8 and external lug 9, the hollow of shell body 6 is set, and its upper portion has shell body opening, observation cover 7 sets up on shell body opening, and observation cover 7 has transparent observation window, battery placing device 8 is used to hold lithium battery cross section block, and battery placing device 8 includes the inner lug of connecting lithium battery cross section block electrode, and the lateral part of shell body 1 is provided with the hole for giving place, and two external lugs 9 respectively pass through the hole for giving place and are contacted and are connected with the inner lug, using the external lug 9 of the utility model can make lithium battery in situ working condition reaction's observation device realize excellent airtightness, prevent external air from entering shell body 6 from the junction of external lug 9 and shell body 6, also can prevent the leakage of electrolyte in shell body 6, and the external lug is integrally arranged, very firm and durable.

[0046] Comparative example 1

[0047] As shown in Figures 7-8 Comparative example 1, the conventional lug 10 specifically includes profiled stud 11 and hollow bolt 12, the profiled stud 11 is inserted in the hollow bolt 12, and then the hollow bolt 12 is inserted in the lithium battery in situ working condition reaction's observation device, and a sealing ring is arranged between the hollow bolt 12 and the shell body 6, and the profiled stud 11 is specifically made of 316L, and the hollow bolt 12 is specifically made of PTFE bolt.

[0048] In order to verify the performance of the external lug of the utility model, the external lug of example 1 and the external lug of comparative example 1 are respectively applied to the same lithium battery in situ working condition reaction's observation device and subjected to charge and discharge test, and the specific experimental method and results are as follows:

[0049] The lithium battery section block is fixed in the battery placing device, then the external tab 9 of Example 1 is screwed into the accommodating hole of the outer shell 6, the external tab 9 is in close contact with the internal tab connecting the electrode of the lithium battery section block, then the electrolyte is added into the observation device of the lithium battery in-situ working condition reaction, and the observation cover 7 is fixed on the upper end of the outer shell 6; finally, the lithium battery section block is subjected to in-situ charge-discharge test.

[0050] The lithium battery section block is fixed in the battery placing device, then the external tab 9 of Example 1 is screwed into the accommodating hole of the outer shell 6, the external tab 9 is in close contact with the internal tab connecting the electrode of the lithium battery section block, then the electrolyte is added into the observation device of the lithium battery in-situ working condition reaction, and the observation cover 7 is fixed on the upper end of the outer shell 6; finally, the lithium battery section block is subjected to in-situ charge-discharge test.

[0051] The lithium battery in-situ reaction using the external tab 9 of Example 1 is taken as the experimental group, and the lithium battery in-situ reaction using the conventional tab 10 of Comparative Example 1 is taken as the control group, as shown in Table 1, the experimental group can realize normal in-situ charge-discharge cycle for 100 weeks, while the control group can only realize abnormal charge-discharge cycle for 10 weeks. Figure 9 In addition, as shown in Table 2, the charge-discharge efficiency of the experimental group is greater than 99% per week, while the coulombic efficiency of the control group is between 10% and 90% per week. Figure 10 In addition, as shown in Table 2, the charge-discharge efficiency of the experimental group is greater than 99% per week, while the coulombic efficiency of the control group is between 10% and 90% per week. Figure 11 In addition, as shown in Table 2, the charge-discharge efficiency of the experimental group is greater than 99% per week, while the coulombic efficiency of the control group is between 10% and 90% per week.

[0052] The above examples are only for illustrating the technical concept and characteristics of the present application, the purpose is to enable the person skilled in the art to understand the content of the present application and to implement it, and it cannot limit the protection scope of the present application. Any equivalent changes or modifications made according to the spirit and essence of the present application shall be covered within the protection scope of the present application.

Claims

1. An external tab, characterized by, The application relates to a first conducting part, a second conducting part, an insulating part and a threaded flange, wherein a groove is arranged on one of the first conducting part and the second conducting part, a convex part is arranged on the other one of the first conducting part and the second conducting part and is inserted into the groove, the first conducting part and the second conducting part are inserted and matched, the second conducting part is arranged at least partially in the insulating part, the second conducting part is in sealed sintering contact with the inner wall of the insulating part, the insulating part is arranged in the threaded flange, the outer wall of the insulating part is in sealed sintering contact with the inner wall of the threaded flange, and the first conducting part and the second conducting part are arranged to be conductive after being inserted. An inner thread is arranged in the groove, and an outer thread matched with the inner thread is arranged on the convex part.

2. The external tab of claim 1, wherein: The second conducting part has a first end and a second end along the length direction, the second end is the convex part, and the first end is used for conducting with an electrode.

3. The overhanging tab of claim 1, wherein: The second conducting part further has a sealing part arranged between the first end and the second end, and the sealing part is in sealed sintering contact with the inner wall of the insulating part.

4. The external tab of claim 3, wherein: The first end, the second end and the sealing part are all circular in cross section, and the cross section diameter of the sealing part is larger than the cross section diameters of the first end and the second end.

5. The overhanging tab of claim 4, wherein: The insulating part is internally hollow, the insulating part internally has a narrow part for accommodating the second end and a wide part for accommodating the sealing part, a resisting wall is arranged between the narrow part and the wide part, and the sealing part is in resisting cooperation with the resisting wall.

6. The overhanging tab of claim 5, wherein: The insulating part is internally hollow, the insulating part internally has an internal thread, and the sealing part externally has a thread structure matched with the internal thread.

7. The overhanging tab of claim 5, wherein: The second conducting part further comprises a contact part in a semi-spherical shape, the contact part is arranged on the second end, and the arched surface of the contact part is used for conducting with the electrode.

8. The overhanging tab of claim 3, wherein: The threaded flange further has a clamping groove arranged thereon, and the clamping groove is used for arranging a sealing ring.

9. The overhanging tab of claim 1, wherein: The material of the first conducting part is stainless steel, the material of the second conducting part is stainless steel, the material of the insulating part is ceramic, and the material of the threaded flange is stainless steel.

10. The overhanging tab of claim 1, wherein: The application relates to an outer shell, an observation cover, and a battery placing device.

11. A device for observing in situ operating reactions of lithium batteries, characterized in that it comprises: The battery placing device is used for containing a lithium battery cross section block, and the battery placing device comprises an inner connecting tab for connecting an electrode of the lithium battery cross section block. An outer connecting tab is arranged on the side of the outer shell, the outer connecting tab passes through a space hole and is in contact connection with the inner connecting tab. ​ ​ ​

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