Battery pole piece observation device in vacuum environment

Abstract

The invention provides a battery pole piece observation device in a vacuum environment, and the device comprises a substrate which is used for bearing a pole piece; the cover plate is arranged above the substrate, and the substrate and the cover plate are bonded through glass cement; the vacuum pump is used for vacuumizing the space between the cover plate and the base plate; one end of the vacuumizing communicating pipe penetrates through the cover plate, and the other end of the vacuumizing communicating pipe is connected with a vacuum pump; the air valve is arranged in the vacuumizing communicating pipe and used for controlling opening and closing of the vacuumizing communicating pipe; electrolyte flows into one end of the electrolyte communicating pipe, and the other end of the electrolyte communicating pipe penetrates through the cover plate; the electrolyte valve is arranged in the electrolyte communicating pipe, and the electrolyte valve is used for being connected with electrolyte to control electrolyte input.

Description

Technical Field

[0001] The present invention relates to the technical field of lithium batteries for new energy vehicles, and in particular to a battery pole piece observation device in a vacuum environment. Background Art

[0002] The background of battery electrode research mainly stems from the continuous demand and exploration of energy storage and utilization. As human beings pay more and more attention to fields such as renewable energy and electric transportation, batteries, as energy storage and release devices, have become one of the focuses. The performance of batteries directly affects the range of electric vehicles, the storage efficiency of renewable energy, and the use time of portable electronic devices.

[0003] Battery pole pieces are one of the important components of batteries, mainly including positive and negative electrodes. The positive electrode is usually composed of positive electrode active materials, conductive agents and electrolytes, while the negative electrode includes negative electrode active materials, conductive agents and electrolytes. The material selection, structural design and preparation process of the electrode piece directly determine the performance of the battery, such as energy density, cycle life, charge and discharge rate, etc. Therefore, the research on battery pole pieces aims to improve the performance and stability of the battery to meet the requirements of growing energy demand and environmental protection.

[0004] The research on battery electrodes involves knowledge from multiple disciplines such as materials science, chemical engineering, and electrochemistry. Researchers are continuously improving battery performance by designing new materials, optimizing preparation processes, and improving electrode structures, and are committed to solving problems that arise during battery cycles, such as capacity decay and safety. These efforts are of great significance in promoting the development of electric vehicles, smart grids, and other fields.

[0005] At present, the research on battery electrode wetting mainly includes the following two methods:

[0006] (1) Experimental disassembly method: disassemble the battery cells with different immersion times, and sample and record the pole pieces. The disadvantage of this method is that it takes a lot of time to disassemble and consumes a lot of materials.

[0007] (2) Simulation method: simulate the infiltration of battery pole pieces. The disadvantage of this method is that after the battery pole pieces are hot pressed and infiltrated, the internal structure of the pole piece stack is complex, and there is a large discrepancy between the simulation study and the actual infiltration time.

[0008] Based on the defects of the above two research methods, the technical problem that needs to be solved urgently is: to develop a battery electrode observation device with simple structure, low cost, less loss and more accurate conclusions. Summary of the invention

[0009] The present invention is made to solve the above-mentioned problems, and aims to provide a battery pole piece observation device in a vacuum environment with a simple structure, less material loss and accurate conclusion.

[0010] The present invention provides a battery pole piece observation device in a vacuum environment, which has the following characteristics, including:

[0011] A substrate for carrying the pole piece;

[0012] A cover plate is arranged above the base plate, and the base plate and the cover plate are bonded by glass glue;

[0013] A vacuum pump is used to evacuate the space between the cover plate and the substrate;

[0014] A vacuum connecting pipe, one end of which passes through the cover plate and the other end is connected to a vacuum pump;

[0015] An air valve is arranged inside the vacuum connecting pipe and is used to control the opening and closing of the vacuum connecting pipe;

[0016] an electrolyte connecting pipe, one end of which is for the electrolyte to flow into, and the other end of which passes through the cover plate; and

[0017] An electrolyte valve is provided in the electrolyte connecting pipe, and the electrolyte valve is used to connect the electrolyte to control the electrolyte input.

[0018] The battery pole piece observation device in a vacuum environment provided by the present invention may also have the following feature: wherein the cover plate and the substrate are transparent PC plates or transparent corrosion-resistant plates.

[0019] The battery electrode observation device in a vacuum environment provided by the present invention may also have the following features: wherein the vacuum pump can pump the space between the substrate and the cover plate to a negative pressure of 10 -2 Pa.

[0020] The battery pole piece observation device in a vacuum environment provided by the present invention may also have the following feature: wherein the length and width of the base plate and the cover plate are both greater than 40 mm.

[0021] The battery pole piece observation device in a vacuum environment provided by the present invention may also have the following feature: wherein the electrolyte connecting pipe penetrates the cover plate at 8-12 mm from the edge and is located at the center in the width direction.

[0022] The battery pole piece observation device in a vacuum environment provided by the present invention may also have the following features: wherein the diameter of the electrolyte connecting pipe is 9-11 mm, the inner diameter is 6-8 mm, and the height is 18-22 mm.

[0023] The battery pole piece observation device in a vacuum environment provided by the present invention may also have the following features: wherein the vacuum connecting tube penetrates the cover plate at the center of the cover plate, and the pole piece is placed under the vacuum connecting tube.

[0024] The battery pole piece observation device in a vacuum environment provided by the present invention may also have the following features: wherein the diameter of the vacuum connecting pipe is 11-13 mm, the inner diameter is 8-10 mm, and the height is 18-22 mm.

[0025] Functions and Effects of the Invention

[0026] According to the battery pole piece observation device in a vacuum environment involved in the present invention, the present invention has a simple structure, and the substrate and cover plate materials are both transparent. By opening and closing the air valve and the electrolyte valve, the wetting effect can be directly observed, and the results obtained are more intuitive, the material loss is less, and the conclusion is more accurate; in order to maintain the airtightness of the entire experimental pole piece area, the present application can effectively prevent the entry of external gas by coating organic glass glue between the cover plate and the substrate with a very small gap and through a valve; in order to reduce the entry of the wetting liquid from the upper and lower sides of the pole piece, the pole piece is tightly fitted by vacuuming and utilizing the external air pressure, so as to try to ensure that the electrolyte is mainly infiltrated from the thickness of the pole piece, which is similar to the actual situation and is also convenient for experimental observation. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 is a side view of a battery electrode observation device in an embodiment of the present invention;

[0028] Figure 2 is a three-dimensional diagram of a battery pole piece observation device in an embodiment of the present invention; and

[0029] Figure 3 It is a cross-sectional view of a battery electrode observation device in an embodiment of the present invention. DETAILED DESCRIPTION

[0030] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or mutual communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0031] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the following embodiments and the accompanying drawings specifically illustrate the battery pole piece observation device in a vacuum environment of the present invention.

[0032] Figure 1 It is a side view of a battery electrode observation device in an embodiment of the present invention.

[0033] Figure 2 It is a stereoscopic diagram of a battery pole piece observation device in an embodiment of the present invention.

[0034] Figure 3 is a cross-sectional view of a battery electrode observation device in an embodiment of the present invention

[0035] like Figure 1-3 As shown, the battery electrode observation device in this embodiment includes: a substrate 7, a cover plate 1, a vacuum pump 4, a vacuum connecting pipe 5, an air valve 3, an electrolyte connecting pipe 6, and an electrolyte valve 2.

[0036] Among them, the substrate 7 is used to carry the electrode 9, the cover plate 1 is arranged above the substrate 7, the substrate 7 and the cover plate 1 are bonded and sealed by organic glass glue 8 on all sides, the cover plate 1 and the substrate 7 are transparent PC plates or transparent corrosion-resistant plates, and the length and width of the substrate 7 and the cover plate 1 are both greater than 40mm.

[0037] The vacuum pump 4 is used to evacuate the space between the cover plate 1 and the substrate 7. The vacuum pump 4 can evacuate the space between the substrate 7 and the cover plate 1 to a negative pressure of 10 -2 Pa, the gap between the substrate 7 and the cover plate 1 is filled by the pole piece 9, and the remaining space is evacuated by the vacuum pump 4.

[0038] One end of the vacuum connecting pipe 5 passes through the cover plate 1, and the other end is connected to the vacuum pump 4. The air valve 3 is arranged inside the vacuum connecting pipe 5 to control the opening and closing of the vacuum connecting pipe 5. The vacuum connecting pipe 5 passes through the cover plate 1 at the center of the cover plate 1. The pole piece 9 is placed under the vacuum connecting pipe 5. The pipe diameter of the vacuum connecting pipe 5 is 11-13mm, the inner diameter is 8-10mm, and the height is 18-22mm.

[0039] The electrolyte flows into one end of the electrolyte connecting pipe 6, and the other end passes through the cover plate 1. An electrolyte valve 2 is provided in the electrolyte connecting pipe 6. The electrolyte valve 2 is used to connect the electrolyte and control the electrolyte input. The electrolyte connecting pipe 6 passes through the cover plate 1 at 8-12mm from the edge and is located at the center in the width direction, avoiding the position of the electrode 9, so that the electrolyte flows in from the side of the electrode 9, ensuring that the electrolyte is infiltrated from the thickness of the electrode 9. The pipe diameter of the electrolyte connecting pipe 6 is 9-11mm, the inner diameter is 6-8mm, and the height is 18-22mm.

[0040] The method of use of the present invention is as follows:

[0041] Close the electrolyte valve 2, open the air valve 3, and start the vacuum pump 4 to directly extract the air from the cover plate 1 and the substrate 7;

[0042] When the negative pressure between the substrate 7 and the cover plate 1 is pumped to 10 -2 When it is below Pa, first close the air valve 3, then close the vacuum pump 4;

[0043] Finally, the electrolyte valve 2 is opened, the liquid is introduced into the gap between the cover plate 1 and the substrate 7, and then the valve is closed, so that the effect of observing the entire wetting process can be achieved.

[0044] The observation method of the present invention is specifically as follows:

[0045] Specifically, the electrolyte absorption can be observed based on the color change of the electrode 9 and the drop in the liquid level of the electrolyte connecting tube 6, and the fitted electrolyte drop curve over time is:

[0046] y=0.2379t 3 +2.7081t 2 -14.597t+19.979

[0047] t is time (unit: h), y is height (unit: cm), and the experimental time is 0-2.5h data.

[0048] Calculation of the amount of electrolyte absorbed by the electrode 9:

[0049] y2=s*y

[0050] s is the inner wall area of ​​the electrolyte connecting tube, and y2 is the electrolyte absorption amount of the electrode 9.

[0051] Functions and Effects of the Embodiments

[0052] The present invention has a simple structure, and the substrate and cover plate materials are both transparent. The wetting effect can be directly observed by opening and closing the air valve and the electrolyte valve, and the obtained result is more intuitive, the material loss is less, and the conclusion is more accurate.

[0053] In order to maintain the airtightness of the entire experimental electrode area, the present application can effectively prevent external gas from entering by coating organic glass glue between the cover plate and the substrate with a very small gap and passing a valve.

[0054] In order to reduce the infiltration of the wetting liquid from the upper and lower sides of the electrode, vacuum is drawn and the external air pressure is used to tightly fit the electrode, so as to ensure that the electrolyte mainly infiltrates from the thickness of the electrode, which is similar to the actual situation and is also convenient for experimental observation.

[0055] The vacuum connecting tube passes through the cover at the center of the cover, and the electrode is placed under the vacuum connecting tube, which enables the vacuum connecting tube to evacuate the surface of the electrode well to ensure a closed space. At the same time, the electrolyte connecting tube passes through the cover at 8-12mm from the edge and is located in the center in the width direction, avoiding the position of the electrode, so that the electrolyte flows in from the side of the electrode to ensure that the electrolyte is infiltrated from the thickness of the electrode.

[0056] Those skilled in the art should understand that the present invention is not limited to the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, and these changes and improvements fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A battery pole piece observation device in a vacuum environment, characterized in that: include: A substrate for carrying the pole piece; A cover plate, the cover plate is arranged above the substrate, and the substrate and the cover plate are bonded by glass glue; A vacuum pump, the vacuum pump is used to evacuate the space between the cover plate and the substrate; A vacuum connecting pipe, one end of which passes through the cover plate and the other end of which is connected to a vacuum pump; An air valve, which is arranged inside the vacuum connecting pipe and is used to control the opening and closing of the vacuum connecting pipe; An electrolyte connecting pipe, one end of which flows the electrolyte and the other end of which penetrates the cover plate; as well as An electrolyte valve is provided in the electrolyte connecting pipe, and the electrolyte valve is used to connect the electrolyte to control the electrolyte input.

2. The battery pole piece observation device in a vacuum environment according to claim 1, characterized in that: in, The cover plate and the base plate are transparent PC plates or transparent corrosion-resistant plates.

3. The battery pole piece observation device in a vacuum environment according to claim 1, characterized in that: in, The vacuum pump can draw the space between the substrate and the cover plate to a negative pressure of 10 -2 Pa.

4. The battery pole piece observation device in a vacuum environment according to claim 1, characterized in that: in, The length and width of the base plate and the cover plate are both greater than 40 mm.

5. The battery pole piece observation device in a vacuum environment according to claim 1, characterized in that: in, The electrolyte connecting pipe penetrates the cover plate at 8-12 mm from the edge and is located at the center in the width direction.

6. The battery pole piece observation device in a vacuum environment according to claim 5, characterized in that: in, The electrolyte connecting pipe has a pipe diameter of 9-11 mm, an inner diameter of 6-8 mm, and a height of 18-22 mm.

7. The battery pole piece observation device in a vacuum environment according to claim 1, characterized in that: in, The vacuum connecting pipe penetrates the cover plate at the center of the cover plate, and the pole piece is placed below the vacuum connecting pipe.

8. The battery pole piece observation device in a vacuum environment according to claim 7, characterized in that: in, The vacuum connecting pipe has a pipe diameter of 11-13 mm, an inner diameter of 8-10 mm, and a height of 18-22 mm.

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