Electrochemical testing device capable of testing original strain of electrode material

Abstract

The utility model discloses an electrochemical testing device capable of testing the original strain of an electrode material, which comprises an upper flange assembly, a battery shell, a lower flange, a positioning base, a binding post, a counter electrode and a working electrode, the counter electrode and the working electrode are connected and fixed in a cavity in the battery shell through binding posts; and the upper flange assembly and the lower flange are respectively arranged on the upper side and the lower side of the battery shell. According to the utility model, the packaged battery is placed on the positioning base, then the positioning base is placed on the test sample table of the X-ray diffractometer, and the coordinate position of the battery is finely adjusted by adjusting the height of the test table, so that the X-ray can enter the inner cavity of the battery shell and is directly focused on the working electrode in the battery after penetrating through the Kapton film; x-ray diffraction signals of the working electrode in the actual electrochemical reaction process are collected, and real-time structure change information of the material in the reaction process is obtained through analysis.

Description

TECHNICAL FIELD

[0001] The utility model relates to electrochemistry testing device technical field, concretely is a kind of electrochemistry testing device of electrode material original strain can be measured. BACKGROUND

[0002] With the development of advanced light source, the energy and speed of incident X-rays are improved, realizing the phase characterization of metastable intermediate phase existing temporarily in the reaction process. In-situ X-ray diffraction characterization is realized by designing a reaction platform in a high-energy X-ray diffractometer, applying an external field (temperature, electricity, chemistry and high pressure) stimulus, collecting the X-ray diffraction signal during the reaction (such as electrochemistry, photocatalysis and electrocatalysis, etc.), and obtaining the real-time microstructure change information of the material under the external field environment or during the reaction, such as phase, crystallinity, lattice distortion, grain size, phase content and lattice parameter changes.

[0003] Alkali metal ion secondary battery electrode materials involve a large number of alkali metal ion insertion / extraction in electrochemical reactions, especially high-capacity electrode materials, which have reversible expansion / contraction behavior in the crystal structure in theory in reversible electrochemical reactions. The expansion / contraction "breathing" behavior of the crystal lattice will generate micro-strain in the electrode material, and severe micro-strain may cause the electrode material to break and powder, shorten the service life of the battery, and even cause safety accidents such as battery short circuit and fire. Therefore, the quantification and real-time monitoring of the micro-strain generated in the electrochemical reaction process of the alkali metal ion battery electrode material are of great significance to improve the service safety of the electrode material. However, due to the lack of real-time monitoring experimental tools for micro-strain, previous studies on the quantification and real-time monitoring of electrode material strain in alkali metal ion batteries are not much. The utility model electrochemistry testing device for measuring real-time changes of electrode material micro-strain is proposed, which is used with an X-ray diffractometer to realize real-time detection of the system strain changes generated by the microstructure evolution (including lattice distortion, phase change, crystallinity change, grain size change, etc.) of high-capacity electrode materials during dynamic electrochemical reactions, quantify the strain values of electrode materials at different potentials, and establish the relationship between the phase change of electrode materials and the system strain in electrochemical reactions. CONTENT OF THE UTILITY MODEL

[0004] The utility model aims at providing a kind of electrochemistry testing device of electrode material original strain can be measured to solve the problems raised in the above background.

[0005] To achieve the above object, the utility model provides the following technical scheme:

[0006] The utility model provides an electrochemical testing device of electrode material original strain, including upper flange assembly, battery case, lower flan, positioning base, terminal post, counter electrode and working electrode, the inside of battery case is equipped with cavity for storing electrolyte, counter electrode and working electrode all are connected and are fixed in the cavity of battery case inside through terminal post, upper flange assembly and lower flan are arranged in the upper and lower both sides of battery case respectively for packing battery case and electrolyte in its inner chamber and form in situ battery, positioning base is arranged in the bottom of lower flan for positioning in situ battery that has packed.

[0007] As a further scheme of the utility model: the battery case is the cylinder that adopts polytetrafluoroethylene material to make, the top center place is equipped with square recess, and one end that the battery case top corresponds square recess groove is provided with step, the bottom of step is higher than the bottom of square recess, and the top of step is flush with the top of square recess, step and square recess jointly constitute the inner chamber of battery case, the inner chamber is used for accommodating battery assembly, the battery assembly includes electrolyte, electrode and corresponding electrical element, the inner wall of battery case is located on the side of step and is located on the side of square recess and is equipped with threaded hole, two threaded holes are opposite and are used for fixing terminal post respectively, the working electrode and the pole lug of counter electrode are fixed in the inner chamber of battery case through two terminal posts respectively, and the working electrode and counter electrode are located on the side of step and the side of square recess respectively.

[0008] As a further scheme of the utility model: the terminal post is composed of terminal screw and polytetrafluoroethylene film that is wound on terminal screw, and the terminal screw that is wound with polytetrafluoroethylene film is drilled into threaded hole, forms terminal post, and two terminal posts are used for connecting working electrode and counter electrode respectively.

[0009] As a further scheme of the utility model: the top of battery case corresponds the outer edge of square recess and is provided with circular recess, the circular recess is provided with sealing ring, the edge of the top of battery case is provided with multiple through holes at equal intervals and surrounds, multiple threaded holes are arranged in multiple through holes and are used for connecting upper flange assembly and lower flan, make upper flange assembly, lower flan and battery case three connection into an entirety, and multiple through holes are located on the outside of circular recess.

[0010] As a further scheme of the utility model: the upper flange assembly includes upper flange and sealing cover, the upper flange is set in the upper of the sealing cover, and the inner wall corresponds the side of multiple through holes and is provided with connecting screw hole, the sealing cover is made of high alumina silica secondary reinforced glass, and its shape is adapted to the shape of the battery shell, the sealing cover is attached to the top of the battery shell, the inner wall of the sealing cover corresponds the side of the square recess and is provided with rectangular through hole, Kapton film is bonded and fixed in the rectangular through hole, the sealing cover is matched with the sealing ring, and is used for sealing the inner cavity of the battery shell and electrolyte in the inner cavity.

[0011] As a further scheme of the utility model: the lower flange is set in the bottom of the battery shell, and the inner wall corresponds the side of multiple through holes and is provided with four positioning screw holes at equal intervals, the positioning screw hole, the through hole and the connecting screw hole are connected by screw, two square through holes are provided on the opposite positions of the side of the lower flange, and two square through holes are used for connecting positive and negative electrode lines respectively, the positive and negative electrode lines extend to the side of the battery shell after passing through two square through holes and are connected and fixed with the bottom ends of two binding posts respectively.

[0012] As a further scheme of the utility model: the working electrode includes electrode and stainless steel base plate, the electrode is independent composite electrode without current collector, one end of the electrode is connected on the stainless steel base plate by cold welding spot welding mode, and the electrode cantileveredly extends outward from the edge of the stainless steel base plate, and the counter electrode is sheet-shaped rectangular structure.

[0013] As a further scheme of the utility model: the upper end face of the positioning base corresponds the side of multiple positioning screw holes and is fixed with first positioning column, the first positioning column is inserted in the positioning screw hole, is used for docking and fixing packaged in-situ battery, the lower end face of the positioning base is provided with two symmetrical second positioning columns, the second positioning column corresponds the fixed recess on the sample table of X-ray diffractometer, is used for docking and fixing packaged in-situ battery on the sample table of X-ray diffractometer.

[0014] Compared with the prior art, the utility model has the beneficial effects as follows:

[0015] The utility model discloses a battery shell is provided with eight through holes on the top, and four symmetrical through holes are matched, and the upper flange assembly and the lower flange are fixed on the upper and lower sides of the battery shell through screws, the battery shell and the electrolyte in it are encapsulated and form an in-situ battery, the sealing cover in the upper flange assembly is matched with the sealing ring on the battery shell, the inner cavity of the battery shell and the electrolyte in the inner cavity can be sealed, and liquid leakage is prevented, further, the upper flange is pasted on the top of the sealing cover, after being placed, screws are used and are drilled into the connecting screw hole and the through hole, after the screw is tightened, the upper flange will press the sealing cover tightly on the top of the battery shell, and the sealing cover and the sealing ring are tightly connected.

[0016] The utility model discloses a battery is placed on the positioning base, and the positioning base can make the battery place more stable, and then the positioning base is placed on the X -ray diffraction instrument sample table, and the coordinate position of the battery is fine -tuned through the height of the test platform adjustment, after the X -ray is penetrated kapton film, can enter the inner chamber of battery shell and direct focus on the working electrode in the battery, through the X -ray diffraction signal of the working electrode in the actual electrochemical reaction process is collected, and then through the change of peak position (such as interplanar spacing), peak shape, peak intensity, so the real -time structural change information of the material during the reaction can be analyzed, such as phase, crystallinity, grain size, phase content and lattice parameter change.

[0017] The utility model discloses a working electrode and counter electrode are independent of each other, and the working electrode in the battery can be detected through the X -ray, and the strain condition of the working electrode in the electrochemical reaction process can be measured, further, the counter electrode is made of lithium metal, when the counter electrode is inserted or taken out, the deformation of macro electrode can be traced to the nanometer level change between active material layers, and further, through the adjustment parameter, such as electrode composition, electrolyte composition and cycle rate, the influence of the change of these parameters on the strain response of layered material can be studied. ACCURACY

[0018] In order to more clearly illustrate the technical scheme of the embodiment of the utility model, the following will be to the embodiment description needed to use the drawing briefly introduced, obviously, the following description in the drawing is only some embodiments of the utility model, for the ordinary skilled person in the art, under the premise of not paying the creative labor, still can obtain other drawings according to these drawings.

[0019] Figure 1 It is the structural schematic diagram of the utility model.

[0020] Figure 2 It is the explosion development drawing of the utility model.

[0021] Figure 3 It is the structural schematic diagram of the battery shell in the utility model.

[0022] Figure 4 It is the top view schematic diagram of the battery shell in the utility model.

[0023] Figure 5 It is the front view sectional view of the battery shell in the utility model.

[0024] Figure 6 It is the front view of the positioning base in the utility model.

[0025] Figure 7 It is the top view of the counter electrode in the utility model.

[0026] Figure 8 It is the top view of the working electrode in the utility model.

[0027] Figure 9 It is the circuit connection schematic diagram when the utility model embodiment case tests.

[0028] Mark annotation:

[0029] 1-upper flange assembly, 11-upper flane, 12-Kapton film, 13-sealing cover, 14-connection screw hole, 15-rectangular through hole;

[0030] 2-battery shell, 21-sealing ring, 22-through hole, 23-step, 24-circular recess, 25-square recess, 26-threaded through hole;

[0031] 3-lower flange, 31-square through hole, 32-positioning screw hole;

[0032] 4-positioning base, 41-first positioning column, 42-second positioning column;

[0033] 5-wiring post, 51-wiring screw, 52-polytetrafluoroethylene film;

[0034] 6-counter electrode;

[0035] 7-working electrode, 71-electrode, 72-stainless steel base plate. DETAILED DESCRIPTION

[0036] The following embodiments will be described in detail in conjunction with the drawings, in the drawings or the description, similar or identical parts use the same reference signs, and in practical application, the shape, thickness or height of each component can be enlarged or reduced. The various embodiments listed in the utility model are only used to illustrate the utility model, and are not used to limit the scope of the utility model. Any obvious modification or change made to the utility model does not deviate from the spirit and scope of the utility model.

[0037] Please refer to Figures 1-8The utility model discloses an electrochemical testing device of electrode material original strain can be measured, including upper flange subassembly 1, battery shell 2, lower flange 3, positioning base 4, binding post 5, counter electrode 6 and working electrode 7, the inside of battery shell 2 is equipped with cavity, is used for storing electrolyte, and counter electrode 6 and working electrode 7 are all through binding post 5 connection fixed in the cavity in the inside of battery shell 2, upper flange subassembly 1 and lower flange 3 are arranged in the upper and lower both sides of battery shell 2 respectively, are used for encapsulating battery shell 2 and the electrolyte in its inner chamber and form in situ battery, positioning base 4 is arranged in the bottom of lower flange 3, is used for positioning the in situ battery that has encapsulated, and this battery is connected and fixed on X -ray diffractometer sample table, and X -ray diffractometer sample table is prior art device (not shown in the drawing), so it is not detailed again.

[0038] Please refer to Figures 2-5 Battery shell 2 is the cylinder that adopts polytetrafluoroethylene material, and the top center place is equipped with square recess 25, and one end in the battery shell 2 top corresponding square recess 25 slot is provided with step 23, the bottom of step 23 is higher than the bottom of square recess 25, and the top of step 23 is flush with the top of square recess 25, in the embodiment, the height difference of step 23 and the top of battery shell 2 is 1.2mm, and step 23 and square recess 25 jointly constitute the inner chamber of battery shell 2, and the inner chamber is used to accommodate battery assembly, and the battery assembly includes electrolyte, electrode and corresponding electrical element;

[0039] The inner wall of battery shell 2 is located on one side of step 23 and is located on one side of square recess 25 and is equipped with threaded hole 26, and two threaded holes 26 are oppositely arranged and are used for fixing binding post 5 respectively, and binding post 5 is composed of binding screw 51 and polytetrafluoroethylene film 52 wound on binding screw 51, and binding screw 51 with polytetrafluoroethylene film 52 is drilled into threaded hole 26, and forms binding post 5, and two binding posts 5 are used for connecting working electrode 7 and counter electrode 6 respectively, in the embodiment, the pole lug of working electrode 7 and counter electrode 6 is fixed in the inner chamber of battery shell 2 through two binding posts 5, and working electrode 7 and counter electrode 6 are located on one side of step 23 and one side of square recess 25 respectively;

[0040] The battery shell 2 is provided with a circular groove 24 at the outer edge of the square groove 25 at the top of the battery shell 2, and a sealing ring 21 is arranged in the circular groove 24. A plurality of through holes 22 are arranged at the edge of the top of the battery shell 2 at equal intervals, and screws are arranged in the plurality of through holes 22, which are used to connect the upper flange assembly 1 and the lower flange 3, so that the upper flange assembly 1, the lower flange 3 and the battery shell 2 are connected into one whole. The plurality of through holes 22 are located outside the circular groove 24. In this embodiment, eight through holes 22 are arranged at the outer edge of the top of the battery shell 2. Four symmetrical through holes 22 are matched and cooperate to fix the upper flange assembly 1 and the lower flange 3 on the upper and lower sides of the battery shell 2 by screws, so as to encapsulate the battery shell 2 and the electrolyte inside and form an in-situ battery.

[0041] Please refer to Figures 7-8 The working electrode 7 includes an electrode 71 and a stainless steel substrate 72. The electrode 71 is an independent composite electrode without a current collector, and is made of a lithium ion battery commercial positive electrode material layered ternary Li(Ni x Mn y Co z )O2 (NMC) with a size of 4×6 mm and a thickness of 1000 μm. One end of the electrode 71 is connected to the stainless steel substrate 72 by cold welding spot welding, and the electrode 71 is cantilevered outward from the edge of the stainless steel substrate 72. The counter electrode 6 is in a sheet-shaped rectangular structure and is made of lithium metal. In this embodiment, the electrode 71 is fixed on the stainless steel substrate 72 by cold welding spot welding, so as to establish an electrical connection between the electrode 71 and the battery circuit. One end of the electrode 71 is connected to the stainless steel substrate 72, and the other end of the electrode 71 is in a movable state and can move freely in the plane. The tab of the electrode 71 is fixed on the step 23 by a nut (i.e., the terminal post 5) thinned to less than 1 mm. After the working electrode 7 is fixed, the counter electrode 6 is fixed at the end away from the working electrode 7 in the square groove 25. After the working electrode 7 and the counter electrode 6 are fixed, the sealing ring 21 is fixed in the circular groove 24.

[0042] Please refer to Figure 2The upper flange assembly 1 comprises an upper flange 11 and a sealing cover 13, the upper flange 11 is arranged above the sealing cover 13, the inner wall of the upper flange 11 is provided with a connecting screw hole 14 corresponding to one side of the plurality of through holes 22, the sealing cover 13 is made of high-alumina-silica secondary strengthened glass, the shape of the sealing cover 13 is matched with the shape of the battery shell 2, the sealing cover 13 is attached to the top of the battery shell 2, the inner wall of the sealing cover 13 is provided with a rectangular through hole 15 corresponding to one side of the square groove 25, a Kapton film 12 is fixedly bonded in the rectangular through hole 15, the Kapton film 12 is an existing product, which is an industrial film capable of penetrating X-rays, the sealing cover 13 cooperates with the sealing ring 21 to seal the inner cavity of the battery shell 2 and the electrolyte in the inner cavity; in the embodiment, the sealing cover 13 is attached to the top of the battery shell 2, and then the upper flange 11 is attached to the top of the sealing cover 13, after the two are placed, screws are used and are screwed into the connecting screw hole 14 and the through hole 22, after the screws are tightened, the upper flange 11 will press the sealing cover 13 tightly on the top of the battery shell 2, so that the top of the battery shell 2 can be sealed and packaged.

[0043] Please refer to Figure 2 , the lower flange 3 is arranged at the bottom of the battery shell 2, the inner wall of the lower flange 3 is provided with four positioning screw holes 32 arranged at equal intervals corresponding to one side of the plurality of through holes 22, the positioning screw hole 32, the through hole 22 and the connecting screw hole 14 are correspondingly arranged, the positioning screw hole 32, the through hole 22 and the connecting screw hole 14 are connected by a screw, the lower flange 3 is connected and fixed at the bottom of the battery shell 2 by the screw, and the battery shell 2 and the battery assembly inside the battery shell 2 can be packaged by cooperating with the upper flange assembly 1, two square through holes 31 are arranged at opposite positions on the side of the lower flange 3, and the two square through holes 31 are respectively used for connecting positive and negative electrode lines, the positive and negative electrode lines extend to one side of the battery shell 2 after penetrating through the two square through holes 31, and are respectively connected and fixed with the bottom ends of the two terminal posts 5.

[0044] Please refer to Figure 2 , Figure 6 , the upper end surface of the positioning base 4 is fixed with a first positioning column 41 corresponding to one side of the plurality of positioning screw holes 32, the first positioning column 41 is inserted into the positioning screw hole 32, and is used for docking and fixing the packaged in-situ battery, the lower end surface of the positioning base 4 is provided with two symmetrical second positioning columns 42, the second positioning column 42 corresponds to a fixed groove on the sample table of the X-ray diffractometer, and is used for docking and fixing the packaged in-situ battery on the sample table of the X-ray diffractometer, after being fixed, the initial coordinates of the testing device can be determined, in the embodiment, the packaged in-situ battery is connected with the sample table of the X-ray diffractometer through the positioning base 4, and the chemical reaction data in the battery is detected through the testing table.

[0045] Working principle:

[0046] For example, as Figure 9As shown, the computer E is connected to the electrochemical testing device D, the packaged in-situ XRD strain battery to be tested is placed on the positioning base 4, the positioning base 4 can make the battery be placed more stably, then the positioning base 4 is placed on the sample table of the X-ray diffractometer, the X-ray diffractometer comprises an X-ray emitter A and an X-ray receiver B; the coordinate position of the battery is fine-tuned by adjusting the height of the testing table C, the electrochemical testing operation parameters are set by the computer E, when testing, the X-ray can enter the inner cavity of the battery shell 2 and be focused on the working electrode 7 in the battery after penetrating the Kapton film 12, the X-ray diffraction signal of the working electrode 7 in the actual electrochemical reaction process is collected, then the real-time structure change information of the material during the reaction, such as phase, crystallinity, grain size, phase content and lattice parameter change, can be analyzed.

[0047] The X-ray diffractometer in the utility model comprises an X-ray emitter and an X-ray receiver, preferably an X-ray diffractometer generated by a German Brueker company, and the model number is BRUKER D8 DISCOVER; the electrochemical testing device of the utility model is purchased from a China Wuhan Blue Electric Electronic Co., Ltd., and the model number is CT3002A; the electrochemical testing operation parameters during testing are set by the Blue Electric battery testing system software installed on the computer.

[0048] It is apparent for those skilled in the art that the utility model is not limited to the details of the above-mentioned exemplary embodiments, and the utility model can be realized in other specific forms without departing from the spirit or basic characteristics of the utility model. Therefore, no matter from which point, the embodiments should be regarded as exemplary and non-restrictive, the scope of the utility model is defined by the appended claims instead of the above description, and therefore all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the utility model. Any figure reference in the claims should not be regarded as limiting the involved claims.

[0049] In addition, it should be understood that, although the present specification is described in terms of embodiments, not every embodiment contains only one independent technical solution, and the description manner of the specification is only for the sake of clarity, and those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can be properly combined to form other embodiments which can be understood by those skilled in the art.

Claims

1. An electrochemical test device for measuring the original strain of an electrode material, characterized by, The utility model relates to a kind of in-situ battery, including upper flange assembly (1), battery shell (2), lower flange (3), positioning base (4), terminal post (5), counter electrode (6) and working electrode (7), the inside of the battery shell (2) is equipped with cavity, for storing electrolyte, the counter electrode (6) and the working electrode (7) are all fixed in the cavity inside the battery shell (2) by the terminal post (5), the upper flange assembly (1) and the lower flange (3) are respectively arranged in the upper and lower two sides of the battery shell (2), for encapsulating the battery shell (2) and electrolyte in its inner cavity and form in-situ battery, the positioning base (4) is arranged at the bottom of the lower flange (3), for positioning in-situ battery that has been encapsulated.

2. The electrochemical test device for measuring the original strain of an electrode material according to claim 1, characterized by, The battery shell (2) is a cylinder made of polytetrafluoroethylene material, a square groove (25) is formed at the center of the top of the battery shell (2), and a step (23) is arranged at one end of the square groove (25) on the top of the battery shell (2). The bottom of the step (23) is higher than the bottom of the square groove (25), and the top of the step (23) is flush with the top of the square groove (25). The step (23) and the square groove (25) together form the inner cavity of the battery shell (2), which is used to accommodate a battery assembly. The battery assembly includes electrolyte, electrodes, and corresponding electrical elements. Threaded holes (26) are formed on one side of the step (23) and one side of the square groove (25) on the inner wall of the battery shell (2). The two threaded holes (26) are oppositely arranged and used to fix the terminal posts (5). The tab of the working electrode (7) and the counter electrode (6) is fixed in the inner cavity of the battery shell (2) through two terminal posts (5), and the working electrode (7) and the counter electrode (6) are located on one side of the step (23) and one side of the square groove (25), respectively.

3. The electrochemical test device for measuring the original strain of an electrode material according to claim 2, characterized by, The terminal post (5) is composed of a terminal screw (51) and a polytetrafluoroethylene film (52) wound around the terminal screw (51). The terminal screw (51) with the polytetrafluoroethylene film (52) wound around it is drilled into the threaded hole (26) to form the terminal post (5). Two terminal posts (5) are used to connect the working electrode (7) and the counter electrode (6), respectively.

4. The electrochemical test device for measuring the original strain of an electrode material according to claim 3, characterized by A circular groove (24) is arranged at the outer edge of the square groove (25) on the top of the battery shell (2). A sealing ring (21) is arranged in the circular groove (24). Multiple through holes (22) are arranged at equal intervals on the edge of the top of the battery shell (2). Screws are arranged in the multiple through holes (22) to connect the upper flange assembly (1) and the lower flange (3), so that the upper flange assembly (1), the lower flange (3), and the battery shell (2) are connected as a whole. The multiple through holes (22) are located outside the circular groove (24).

5. The electrochemical test device for measuring the original strain of an electrode material according to claim 4, characterized by, The upper flange assembly (1) comprises an upper flange (11) and a sealing cover (13), the upper flange (11) is arranged above the sealing cover (13), the inner wall of the upper flange (11) is provided with a connecting screw hole (14) corresponding to one side of a plurality of through holes (22), the sealing cover (13) is made of high-aluminum silicon secondary reinforced glass, the shape of the sealing cover (13) is matched with the shape of the battery shell (2), the sealing cover (13) is attached to the top of the battery shell (2), a rectangular through hole (15) is formed in the inner wall of the sealing cover (13) corresponding to one side of the square groove (25), a Kapton film (12) is bonded and fixed in the rectangular through hole (15), the sealing cover (13) is matched with the sealing ring (21), and the sealing cover (13) is used for sealing the inner cavity of the battery shell (2) and electrolyte in the inner cavity.

6. The electrochemical test device for measuring the original strain of an electrode material according to claim 5, wherein The lower flange (3) is arranged at the bottom of the battery shell (2), the inner wall of the lower flange (3) is provided with four positioning screw holes (32) arranged at equal intervals corresponding to one side of a plurality of through holes (22), connecting screws are arranged between the positioning screw holes (32), the through holes (22) and the connecting screw holes (14), two square through holes (31) are formed at opposite positions of the side surface of the lower flange (3), and the two square through holes (31) are used for connecting positive and negative electrode lines, respectively.

7. The electrochemical test device for measuring the original strain of an electrode material according to claim 1 or 6, characterized by, The working electrode (7) comprises an electrode (71) and a stainless steel substrate (72), the electrode (71) is an independent composite electrode without a current collector, one end of the electrode (71) is connected to the stainless steel substrate (72) by cold welding spot welding, and the electrode (71) is cantilevered outward from the edge of the stainless steel substrate (72); the counter electrode (6) is a sheet-shaped rectangular structure.

8. The electrochemical test device for measuring the original strain of an electrode material according to claim 6, wherein The upper end surface of the positioning base (4) is fixed with a first positioning column (41) corresponding to one side of a plurality of positioning screw holes (32), the first positioning column (41) is inserted into the positioning screw hole (32), and the first positioning column (41) is used for docking and fixing the packaged in-situ battery, the lower end surface of the positioning base (4) is provided with two symmetrical second positioning columns (42), the second positioning column (42) corresponds to a fixed groove on an X-ray diffractometer sample table, and the second positioning column (42) is used for docking and fixing the packaged in-situ battery on the X-ray diffractometer sample table.

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