CN219715311U - Miniature in-situ stretching-electrochemical coupling testing device - Google Patents

Abstract

The utility model belongs to the technical field of electrochemistry, and particularly relates to a miniature in-situ stretching-electrochemistry coupling testing device, which comprises an electrochemistry experiment mechanism and a stretching mechanism; the electrochemical experiment mechanism is connected with the stretching mechanism; the stretching mechanism is suitable for stretching the electrochemical experiment mechanism, and the electrochemical experiment mechanism is suitable for detecting electrochemical performance when stretched; the electrode deformation is realized, the electrochemical performance change is tested, the method is simple and effective, complicated operation is not needed, the reaction failure of anode and cathode materials and electrolyte with water oxygen in the air is reduced, and the electrode state change is avoided.

Description

Miniature in-situ stretching-electrochemical coupling testing device

Technical Field

The utility model belongs to the technical field of electrochemistry, and particularly relates to a miniature in-situ stretching-electrochemistry coupling testing device.

Background

Electrodes are the core of many electrochemical devices, such as batteries, capacitors, electrocatalysis, etc., and play a vital role in their performance. The stress state of the electrode has a remarkable influence on the electrochemical performance of the electrode, but is limited by a testing means and a testing method, and the mechanical-electrochemical interaction of the electrode is generally researched by adopting an ex-situ method, namely, firstly, the electrode to be tested is mechanically deformed through a mechanical experimental instrument, then the deformed electrode is assembled into a battery, and the change of the electrochemical performance of the battery is tested.

The ex-situ method is inefficient and has poor accuracy. Firstly, the ex-situ method is difficult to timely and accurately capture electrochemical performance caused by stress variation; in addition, many electrode systems are extremely sensitive to the environment, for example: the anode and cathode materials and electrolyte of the lithium ion battery are easy to react with water oxygen in the air to fail, and the complicated operation is easy to cause the failure of the electrode; again, subsequent operations may also cause changes in the electrode state, for example, introducing additional assembly pressure when assembling the battery, resulting in unreliable test results.

Therefore, the development and utilization of the in-situ mechanical-electrochemical testing device can accurately acquire the electrochemical data of the testing electrode in real time under the stress state, and has very important significance for developing the high-performance electrode.

The in-situ stretching-electrochemical coupling miniature testing device is connected with an electrochemical workstation, a battery charge-discharge testing system and the like, so that electrochemical signals of the acquisition electrode under the stretching deformation condition can be conveniently obtained.

Therefore, there is a need to design a new micro in-situ stretch-electrochemical coupling test device.

Disclosure of Invention

The utility model aims to provide a miniature in-situ stretching-electrochemical coupling testing device, which aims to solve the technical problems of electrode deformation and electrochemical performance change testing.

In order to solve the technical problems, the utility model provides a miniature in-situ stretching-electrochemical coupling testing device, which comprises:

an electrochemical experiment mechanism and a stretching mechanism;

the electrochemical experiment mechanism is connected with the stretching mechanism;

the stretching mechanism is suitable for stretching the electrochemical experiment mechanism, and the electrochemical experiment mechanism is suitable for detecting electrochemical performance when being stretched.

Further, the electrochemical test mechanism includes: an electrode to be measured, an electrochemical cell, a diaphragm and a counter electrode;

the electrochemical cell is arranged on the top surface of the electrode to be tested;

the separator is disposed inside the electrochemical cell;

the electrode is arranged on the top surface of the diaphragm;

the electrode to be tested is connected with the stretching mechanism.

Further, the electrochemical experiment mechanism further includes: an insulating plate;

the insulating plate is arranged on the bottom surface of the electrode to be tested;

the bottom surface of the insulating plate is provided with a supporting seat;

the electrode to be tested and the insulating plate are suitable for being connected with the supporting seat.

Further, a sealing ring is arranged between the bottom surface of the electrochemical cell and the top surface of the electrode to be tested.

Further, the counter electrode and the electrode to be measured are suitable for being connected through a wire.

Further, the plane of the electrochemical cell is provided with a cover plate;

the cover plate is provided with a handle;

the cover plate is adapted to completely cover the electrochemical cell.

Further, the stretching mechanism includes: the device comprises a stepping motor, a motion screw rod and a connecting piece;

one end of the moving screw rod is connected with the insulating plate and the electrode to be tested through a connecting piece, namely, the moving screw rod passes through the electrode to be tested, the insulating plate and the connecting piece through a screw rod front end fixing clamp;

the other end of the motion screw rod passes through the stepping motor, and the stepping motor is suitable for driving the motion screw rod to move.

Further, the electrochemical experiment mechanism and the stretching mechanism are both arranged in the environment box.

Further, a sensor assembly is provided on the stretching mechanism, and the sensor assembly is adapted to detect the displacement amount of the stretching mechanism and the force applied to the electrochemical experiment mechanism when the stretching mechanism stretches the electrochemical experiment mechanism.

Further, the sensor assembly includes: the device comprises a displacement sensor, a mechanical sensor and a base;

the base is arranged on one side of the stepping motor;

the displacement sensor is arranged on the base;

the displacement sensor is connected with one end of the moving screw rod penetrating through the stepping motor;

the mechanical sensor is arranged on the motion screw rod and is arranged between the stepping motor and the connecting piece;

the displacement sensor is suitable for detecting the displacement of the moving screw rod;

the mechanical sensor is suitable for detecting the force applied to the moving screw rod so as to detect the force applied to the electrochemical experiment mechanism.

The utility model has the beneficial effects that the utility model is connected with the stretching mechanism through the electrochemical experiment mechanism; the stretching mechanism is suitable for stretching the electrochemical experiment mechanism, and the electrochemical experiment mechanism is suitable for detecting electrochemical performance when stretched; the electrode deformation is realized, the electrochemical performance change is tested, the method is simple and effective, complicated operation is not needed, the reaction failure of anode and cathode materials and electrolyte with water oxygen in the air is reduced, and the electrode state change is avoided.

Additional features and advantages of the utility model will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the utility model. The objectives and other advantages of the utility model will be realized and attained by the structure particularly pointed out in the written description and drawings.

In order to make the above objects, features and advantages of the present utility model more comprehensible, preferred embodiments accompanied with figures are described in detail below.

Drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present utility model, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic diagram of a miniature in-situ tensile-electrochemical coupling test device of the present utility model;

FIG. 2 is a schematic structural view of a cover plate of the present utility model;

FIG. 3 is a schematic view of the lithium deposition curve of the copper foil after in-situ tensile elastic deformation according to the present utility model;

fig. 4 is a lithium deposition profile of the copper foil after in-situ tensile elastic deformation in accordance with the present utility model.

In the figure:

the electrochemical experiment mechanism 100, an electrode to be detected 102, an insulating plate 103, an electrochemical cell 104, a diaphragm 105, a counter electrode 106, a lead screw front end fixing clamp 107, a sealing ring 108 and a supporting seat 109;

the drawing mechanism 200, the moving screw 201a, the connecting piece 201b, the stepping motor 203 and the base 205;

a cover 218 and a handle 219;

a sensor assembly 300, a mechanical sensor 301, a displacement sensor 302.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more apparent, the technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

As shown in fig. 1 to 4, the present embodiment provides a micro in-situ stretching-electrochemical coupling testing device, which includes: an electrochemical experiment mechanism 100 and a stretching mechanism 200; the electrochemical experiment mechanism 100 is connected with the stretching mechanism 200; the stretching mechanism 200 is suitable for stretching the electrochemical experiment mechanism 100, and the electrochemical experiment mechanism 100 is suitable for detecting electrochemical performance when being stretched; the deformation of the electrode (the electrode 102 to be tested) is realized, the electrochemical performance change is tested, the method is simple and effective, complicated operation is not needed, the reaction failure of the anode material, the cathode material, the electrolyte and the water oxygen in the air is reduced, and the change of the electrode state is avoided; when the stretching mechanism 200 stretches the electrochemical test mechanism, the electrode 102 to be tested in the electrochemical test mechanism 100 is stretched, so that the electrode 102 to be tested is deformed, and the electrochemical performance change is tested.

In this embodiment, the electrochemical test mechanism 100 includes: an electrode 102 to be measured, an electrochemical cell 104, a membrane 105 and a counter electrode 106; the electrochemical cell 104 is disposed on the top surface of the electrode 102 to be tested; the membrane 105 is disposed inside the electrochemical cell 104; the electrode is disposed on the top surface of the diaphragm 105; the electrode to be measured 102 is connected with the stretching mechanism 200; copper foil may be used as the electrode 102 to be tested, and lithium may be used as the counter electrode 106. Firstly, placing an electrochemical cell 104 on an electrode 102 to be tested, adding lithium electrolyte, then placing a diaphragm 105, dripping lithium electrolyte again, then placing a counter electrode 106 (a metal lithium sheet) on the upper part of the diaphragm 105, finally placing the assembled miniature in-situ stretching-electrochemical coupling testing device into an environment box, setting the testing temperature to be 25 ℃, then connecting the electrode 102 to be tested and the counter electrode 106 through a wire, sequentially penetrating a moving screw 201a through a stepping motor 203 and a connecting piece 201b, sequentially fixing the electrode 102 to be tested and an insulating plate 103 through a screw front end clamp by the connecting piece 201b, fixing the electrode 102 to be tested and the insulating plate 103 on the top surface of a supporting seat 109 by a supporting seat fixing clamp, covering a top cover plate 218, pulling the moving screw 201a to apply displacement so as to change the stretching state of the testing electrode, and collecting real-time electrochemical information.

In this embodiment, the electrochemical experiment mechanism 100 further includes: an insulating plate 103; the insulating plate 103 is arranged on the bottom surface of the electrode 102 to be tested; a supporting seat 109 is arranged on the bottom surface of the insulating plate 103; the electrode to be measured 102 and the insulating plate 103 are adapted to be connected to the support base 109; the electrode to be measured 102, the insulating plate 103 and the support base 109 are sequentially passed through the support base 109 fixing jig from top to bottom, for example, so that the electrode to be measured 102 and the insulating plate 103 are fixed on the top surface of the support base 109.

In this embodiment, a sealing ring 108 is disposed between the bottom surface of the electrochemical cell 104 and the top surface of the electrode 102 to be tested; leakage of liquid in the electrochemical cell 104 is avoided by the seal ring 108.

In this embodiment, the counter electrode 106 and the electrode to be measured 102 are adapted to be connected by a wire.

In this embodiment, the planar surface of the electrochemical cell 104 is provided with a cover plate 218; the cover plate 218 is provided with a handle 219; the cover plate 218 is adapted to completely cover the electrochemical cell 104, i.e., the size of the cover plate 218 is slightly larger than the size of the electrochemical cell 104; the top cover plate 218 is required to be covered after the electrolyte is added, so that the anode and cathode materials of the lithium ion battery and the electrolyte are extremely easy to react with water oxygen in the air to fail.

In this embodiment, the stretching mechanism 200 includes: a stepping motor 203, a moving screw 201a, and a connecting member 201b; one end of the moving screw 201a is connected with the insulating plate 103 and the electrode 102 to be tested through a connecting piece 201b, namely, the moving screw passes through the electrode 102 to be tested, the insulating plate 103 and the connecting piece 201b through a screw front end fixing clamp 107; the other end of the moving screw 201a passes through the stepping motor 203, and the stepping motor 203 is suitable for driving the moving screw 201a to move; the in-situ mechanical-electrochemical testing device is utilized to accurately acquire electrochemical data of the electrode 102 to be tested in real time in a stressed state, so that the method has very important significance in developing the electrode with high performance. The connecting piece 201b reciprocates through the rotation of the motion lead screw, so that the loading of the electrode 102 to be tested is realized, the stroke of the motion lead screw 201a can be 0.1 mu m-50cm in precision, and the loading of 0.1N-20kN can be realized through replacing the mechanical sensor 301.

In this embodiment, the electrochemical experiment mechanism 100 and the stretching mechanism 200 are both disposed in an environmental chamber; the electrochemical test environment is regulated and controlled through the environment box.

In this embodiment, the stretching mechanism 200 is provided with a sensor assembly 300, and the sensor assembly 300 is adapted to detect the displacement amount of the stretching mechanism 200 and the force applied to the electrochemical testing mechanism 100 when the stretching mechanism 200 stretches the electrochemical testing mechanism 100; the manual operation is shared, so that the collected signals are more stable and clear.

In this embodiment, the sensor assembly 300 includes: a displacement sensor 302, a mechanical sensor 301, and a base 205; the base 205 is disposed at one side of the stepper motor 203; the displacement sensor 302 is disposed on the base 205; the displacement sensor 302 is connected with one end of the moving screw 201a penetrating through the stepping motor 203; the mechanical sensor 301 is arranged on the moving screw 201a, and the mechanical sensor 301 is arranged between the stepper motor 203 and the connecting piece 201b; the displacement sensor 302 is adapted to detect the displacement amount of the moving screw 201 a; the mechanical sensor 301 is adapted to detect a force applied to the moving screw 201a to detect a force applied to the electrochemical test mechanism 100; the displacement sensor 302 accurately measures the position change through the magnetostriction principle, the mechanical sensor 301 converts the force value into a measurable quantity, the electrode 102 to be measured and the counter electrode 106 are connected with electrochemical test equipment through leads, and electrochemical signals in the in-situ stretching process are collected through a control system.

The method comprises the steps of using copper foil and lithium as an electrode 102 to be tested and a counter electrode 106, placing an electrochemical cell 104 on the copper foil, adding electrolyte for lithium electricity, then placing a diaphragm 105, dripping the electrolyte for lithium electricity again, then placing a metal lithium sheet on the upper part of the diaphragm 105, setting the test temperature to 25 ℃, feeding back a signal to an in-situ tensile test system through a control system, uniformly stretching the copper foil, setting the loading rate to 0.005 mm/s, setting the stretching length to 0.1mm, performing discharge test in the stretching process, setting the discharge current to 0.1 mA, and setting the discharge termination condition to 0.13 mAh, so as to obtain a voltage-time curve during electrodeposition and a profile chart as shown in fig. 3-4 after deposition.

In summary, the present utility model is directed to an electrochemical testing device 100 and a stretching device 200; the electrochemical experiment mechanism 100 is connected with the stretching mechanism 200; the stretching mechanism 200 is suitable for stretching the electrochemical experiment mechanism 100, and the electrochemical experiment mechanism 100 is suitable for detecting electrochemical performance when being stretched; the electrode deformation is realized, the electrochemical performance change is tested, the method is simple and effective, complicated operation is not needed, the reaction failure of anode and cathode materials and electrolyte with water oxygen in the air is reduced, and the electrode state change is avoided.

The components (components not illustrating the specific structure) selected in the present utility model are common standard components or components known to those skilled in the art, and the structures and principles thereof are known to those skilled in the art through technical manuals or through routine experimental methods.

In the description of embodiments of the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

In the description of the present utility model, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the several embodiments provided by the present utility model, it should be understood that the disclosed systems, devices, and methods may be implemented in other manners. The above-described apparatus embodiments are merely illustrative, for example, the division of the units is merely a logical function division, and there may be other manners of division in actual implementation, and for example, multiple units or components may be combined or integrated into another system, or some features may be omitted, or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be through some communication interface, device or unit indirect coupling or communication connection, which may be in electrical, mechanical or other form.

The units described as separate units may or may not be physically separate, and units shown as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

In addition, each functional unit in the embodiments of the present utility model may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit.

With the above-described preferred embodiments according to the present utility model as an illustration, the above-described descriptions can be used by persons skilled in the relevant art to make various changes and modifications without departing from the scope of the technical idea of the present utility model. The technical scope of the present utility model is not limited to the description, but must be determined according to the scope of claims.

Claims (9)

1. A miniature in-situ stretch-electrochemical coupling test device, comprising:

an electrochemical experiment mechanism and a stretching mechanism;

the electrochemical experiment mechanism is connected with the stretching mechanism;

the stretching mechanism is suitable for stretching the electrochemical experiment mechanism, and the electrochemical experiment mechanism is suitable for detecting electrochemical performance when stretched;

the electrochemical experiment mechanism comprises: an electrode to be measured, an electrochemical cell, a diaphragm and a counter electrode;

the electrochemical cell is arranged on the top surface of the electrode to be tested;

the separator is disposed inside the electrochemical cell;

the electrode is arranged on the top surface of the diaphragm;

the electrode to be tested is connected with the stretching mechanism.

2. A micro in situ tensile-electrochemical coupling test device according to claim 1, wherein,

the electrochemical experiment mechanism further comprises: an insulating plate;

the insulating plate is arranged on the bottom surface of the electrode to be tested;

the bottom surface of the insulating plate is provided with a supporting seat;

the electrode to be tested and the insulating plate are suitable for being connected with the supporting seat.

3. A micro in situ tensile-electrochemical coupling test device according to claim 1, wherein,

and a sealing ring is arranged between the bottom surface of the electrochemical cell and the top surface of the electrode to be tested.

4. A micro in situ tensile-electrochemical coupling test device according to claim 1, wherein,

the counter electrode and the electrode to be measured are connected through a lead.

5. A micro in situ tensile-electrochemical coupling test device according to claim 1, wherein,

the plane of the electrochemical cell is provided with a cover plate;

the cover plate is provided with a handle;

the cover plate is adapted to completely cover the electrochemical cell.

6. A micro in situ tensile-electrochemical coupling test device according to claim 2, wherein,

the stretching mechanism includes: the device comprises a stepping motor, a motion screw rod and a connecting piece;

one end of the moving screw rod is connected with the insulating plate and the electrode to be tested through a connecting piece, namely, the moving screw rod passes through the electrode to be tested, the insulating plate and the connecting piece through a screw rod front end fixing clamp;

the other end of the motion screw rod passes through the stepping motor, and the stepping motor is suitable for driving the motion screw rod to move.

7. A micro in situ tensile-electrochemical coupling test device according to claim 1, wherein,

the electrochemical experiment mechanism and the stretching mechanism are both arranged in the environment box.

8. The micro in-situ stretch-electrochemical coupling test device according to claim 6, wherein,

the stretching mechanism is provided with a sensor assembly, and the sensor assembly is suitable for detecting the displacement of the stretching mechanism and detecting the force applied to the electrochemical experiment mechanism when the stretching mechanism stretches the electrochemical experiment mechanism.

9. The micro in-situ stretch-electrochemical coupling test device according to claim 8,

the sensor assembly includes: the device comprises a displacement sensor, a mechanical sensor and a base;

the base is arranged on one side of the stepping motor;

the displacement sensor is arranged on the base;

the displacement sensor is connected with one end of the moving screw rod penetrating through the stepping motor;

the mechanical sensor is arranged on the motion screw rod and is arranged between the stepping motor and the connecting piece;

the displacement sensor is suitable for detecting the displacement of the moving screw rod;

the mechanical sensor is suitable for detecting the force applied to the moving screw rod so as to detect the force applied to the electrochemical experiment mechanism.