Electrode plate wettability testing device

Abstract

The utility model discloses an electrode plate wettability testing device, which relates to the technical field of batteries and comprises a box shell, a glass panel capable of being opened on one side is mounted on the box shell, a pressure gauge is arranged at the lower end of the glass panel, and an electrode plate placing area is arranged in the box shell. The pole piece is arranged in the pole piece placing area through the upper fixer and the lower fixer, the lower fixer is arranged in the electrode liquid storage pool, the upper fixer is arranged on the telescopic tool, the telescopic tool is arranged below the top plate of the box body shell, the side surface of the box body shell is also provided with an air pipe, and the air pipe is arranged in the box body shell. According to the utility model, the arranged pole piece placing area can be clamped by the light-transmitting glass plate, so that the flatness of the pole piece in the test process is ensured; according to the utility model, the wettability of the pole piece can be tested in an inert gas atmosphere, and the wettability effect of the pole piece in the battery can be accurately reflected.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a device for testing the wettability of an electrode sheet. Background Art

[0002] The wettability of the electrolyte in the electrode is one of the key factors affecting product performance. Good wettability allows the positive electrode material to contact the ions in the electrolyte more quickly, thereby improving charge transfer efficiency and increasing the battery's energy density and charging speed. If the electrolyte cannot fully penetrate the electrode surface, it may lead to the formation of "dead zones", restricting the transmission of lithium ions and thus affecting the battery's cycle performance. In addition, uneven wetting may lead to uneven current density distribution, resulting in an unstable electrolyte interface film and affecting battery life.

[0003] Evaluating electrode wettability plays a crucial role in battery performance. Currently, the industry's primary method for testing electrode wettability is the wetting height method, which assesses the electrode's wettability based on the mass of electrolyte infiltrated over a specific period of time. This method involves issues such as electrolyte volatilization from the electrode, residual electrolyte at the electrode's wetted end, and weighing errors, leading to poor test repeatability and invalid results, making it impossible to accurately evaluate the electrode's wettability. Utility Model Content

[0004] The purpose of the present invention is to provide an electrode sheet wettability testing device to solve the above-mentioned defects caused by the prior art.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: an electrode sheet wettability testing device, comprising a box shell, a glass panel that can be opened on one side is installed on the box shell, a pressure gauge is provided at the lower end of the glass panel, an electrode placement area is provided in the box shell, the electrode is installed in the electrode placement area through an upper fixture and a lower fixture, the lower fixture is installed in the electrode liquid storage tank, the upper fixture is installed on a telescopic tool, and the telescopic tool is installed under the top plate of the box shell, and an air pipe is also provided on the side of the box shell, and the air pipe is connected to the external inert gas interface through a valve.

[0006] Preferably, a sealing rubber ring is provided on the edge of the glass panel.

[0007] Preferably, a handle is provided on the glass panel.

[0008] Preferably, a timely start button is provided on the glass panel.

[0009] Preferably, the air pipe is also connected to a vacuum interface via a valve.

[0010] Preferably, two transparent glass plates are provided in the electrode placement area, and scales are provided on the transparent glass plates.

[0011] Preferably, the telescopic tooling comprises an upper connecting plate, a lower connecting plate and an elastic rope, wherein the upper connecting plate is connected to the box shell, and the top of the elastic rope is connected to the upper connecting plate and the bottom is connected to the lower connecting plate.

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] 1. The electrode placement area provided in the present invention can be clamped by a transparent glass plate to ensure that the electrode is flat during the test;

[0014] 2. The utility model can realize the wettability test of the electrode in an inert gas atmosphere, and accurately reflect the wettability effect of the electrode inside the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the structure of the utility model.

[0016] Among them: 1-glass panel; 2-handle; 3-sealing rubber ring; 4-timing start button; 5-pressure gauge; 6-electrolyte storage tank; 7-box shell; 8-valve; 9-vacuum interface; 10-inert gas interface; 11-box air pipe interface; 12-lower holder; 13-electrode placement area; 14-electrode upper holder; 15-telescopic tooling. DETAILED DESCRIPTION

[0017] In order to make the technical means, creative features, objectives and effects achieved by the present invention easier to understand, the present invention is further described below in conjunction with specific implementation methods.

[0018] See also Figure 1 The present invention provides a technical solution: it includes a box shell 7, a glass panel 1 that can be opened on one side is installed on the box shell 7, a pressure gauge 5 is provided at the lower end of the glass panel 1, and a pole piece placement area 13 is provided in the box shell 7. The pole piece is installed in the pole piece placement area 13 through an upper fixture 14 and a lower fixture 12. The lower fixture 12 is installed in the electrode liquid storage tank 6. The upper fixture 14 is installed on a telescopic tooling 15, and the telescopic tooling 15 is installed under the top plate of the box shell 7. An air pipe 11 is also provided on the side of the box shell 7. The air pipe 11 is connected to an external inert gas interface 10 through a valve 8. The upper fixture 14 and the lower fixture 12 are both spring clips, which can clamp the upper and lower ends of the pole piece placement area 13 to help fix the pole piece.

[0019] In this embodiment, a sealing rubber ring 3 is provided on the edge of the glass panel 1 to ensure the sealing of the entire interior of the box.

[0020] In this embodiment, a handle 2 is provided on the glass panel 1 to facilitate opening and closing the glass panel 1 .

[0021] In this embodiment, a timely start button 4 is provided on the glass panel 1 for recording the time the electrolyte has been soaking in the electrode, and is also the button for controlling the device to start testing.

[0022] In this embodiment, the air pipe 11 is also connected to the vacuum interface 9 through the valve 8. The valve 8 is a valve that connects the vacuum pipeline and the inert gas pipeline. When it is opened, the box is evacuated and then the inert gas is replenished. Finally, the valve 8 is closed to ensure the environment inside the entire testing device.

[0023] In this embodiment, two transparent glass plates are provided in the electrode placement area 13, and the transparent glass plates are provided with scales. The electrode is placed between the glass plates, and the glass plates and the electrode are fixed by the upper fixer 14 and the lower fixer 12, thereby ensuring the flatness of the electrode and improving the accuracy of the test. At the same time, the transparent glass plate is provided with a scale ruler, and the wetting height of the electrode can be directly read.

[0024] In this embodiment, the telescopic tooling 15 includes an upper connecting plate, a lower connecting plate and an elastic rope. The upper connecting plate is connected to the box shell 7. The top of the elastic rope is connected to the upper connecting plate and the bottom is connected to the lower connecting plate. After clamping the glass plate and the electrode, the two pull down the elastic rope through gravity to immerse the bottom of the electrode in the electrolyte storage tank 6 for testing.

[0025] Example:

[0026] 1. Take different compaction densities of 2.2, 2.4, and 2.6 g / cm 3 Several lithium iron phosphate pole pieces, each pole piece is 5 cm wide;

[0027] 2. Open the glass panel 1, place the electrode in the test area, and clamp it with the upper fixture 14 and the lower fixture 12;

[0028] 3. Close the glass panel 1, then open the start valve 8 and turn on the vacuum pump. When the vacuum degree in the box reaches -0.1Mpa, close the valve 8, then turn on the inert gas, and then open the valve 8 to fill the inert gas;

[0029] 4. Click the timing start button 4 to start the test;

[0030] 5. Repeat the above test 6 times and compare the test data.

[0031] Test data:

[0032]

[0033]

[0034] It can be seen from the ferrophosphorus electrodes with different compactions that as the compaction density increases, the electrode wetting effect becomes worse;

[0035] At the same time, the coefficient of variation of the electrode infiltration rate test results under the same compaction is low, indicating that the data tested by this device has good repeatability and high accuracy.

[0036] Based on the above, the electrode placement area set in the present invention can ensure the flatness of the electrode during the test process by clamping the transparent glass plate; the present invention can realize the wettability test of the electrode in an inert gas atmosphere and accurately reflect the wetting effect of the electrode inside the battery.

[0037] It is understood from common technical knowledge that the present invention may be implemented through other embodiments that do not depart from its spirit or essential features. Therefore, the embodiments disclosed above are, in all respects, merely illustrative and not exclusive. All modifications within the scope of the present invention or equivalent to the scope of the present invention are intended to be encompassed by the present invention.

Claims

1. An electrode sheet wettability testing device, characterized by: The invention comprises a box shell (7), wherein a glass panel (1) capable of being opened on one side is installed on the box shell (7), a pressure gauge (5) is provided at the lower end of the glass panel (1), an electrode placement area (13) is provided in the box shell (7), the electrode is installed in the electrode placement area (13) through an upper fixer (14) and a lower fixer (12), the lower fixer (12) is installed in an electrode liquid storage tank (6), the upper fixer (14) is installed on a telescopic tool (15), and the telescopic tool (15) is installed below the top plate of the box shell (7), and an air pipe (11) is further provided on the side of the box shell (7), and the air pipe (11) is connected to an external inert gas interface (10) through a valve (8).

2. The electrode sheet wettability testing device according to claim 1, characterized in that: A sealing rubber ring (3) is provided on the edge of the glass panel (1).

3. The electrode sheet wettability testing device according to claim 1, characterized in that: A handle (2) is provided on the glass panel (1).

4. The electrode sheet wettability testing device according to claim 1, characterized in that: The glass panel (1) is provided with a timely start button (4).

5. The electrode sheet wettability testing device according to claim 1, characterized in that: The air pipe (11) is also connected to the vacuum interface (9) via a valve (8).

6. The electrode sheet wettability testing device according to claim 1, characterized in that: Two transparent glass plates are provided in the electrode placement area (13), and scales are provided on the transparent glass plates.

7. The electrode sheet wettability testing device according to claim 1, characterized in that: The telescopic tool (15) comprises an upper connecting plate, a lower connecting plate and an elastic rope, wherein the upper connecting plate is connected to the box shell (7), and the top of the elastic rope is connected to the upper connecting plate and the bottom is connected to the lower connecting plate.

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