Electrolyte Wetting Rate Tester

Abstract

The utility model discloses an electrolyte infiltration rate testing mechanism, which uses a capillary and a CCD camera to automatically detect the electrolyte infiltration rate in real time, and can adjust the verticality of the capillary in real time to ensure accuracy. The electrolyte infiltration rate testing mechanism includes a machine, a CCD camera, a rotating device, a detection bracket, a verticality adjustment device, a clamping device, a capillary, a secondary light source component and a sample stage; the CCD camera and the rotating device are both installed on the machine; the detection bracket includes a turntable driven by the rotating device to rotate, and a mounting frame integrally connected to the turntable; the verticality adjustment device is lifted and matched on the front of the mounting frame and is coaxially arranged with the turntable; the clamping device is installed at the axis center of the lower surface of the verticality adjustment device, and is used to clamp the capillary; the secondary light source component is installed on the side of the mounting frame; the sample stage is arranged on the turntable, and is used to place the part to be detected.

Description

Technical Field

[0001] The utility model relates to the technical field of battery detection, in particular to an electrolyte infiltration rate testing mechanism. Background Art

[0002] The electrolyte infiltration rate of the pole piece or diaphragm has a great influence on the performance of the battery: when the electrolyte infiltration rate is low, it is easy to cause the ion transmission path to become longer, hindering the ion from shuttling between the positive and negative pole pieces; and the position on the pole piece that is not infiltrated by the electrolyte will not be able to participate in the electrochemical reaction of the battery; at the same time, the battery interface resistance increases, affecting the battery's rate performance, discharge capacity and service life. However, the electrolyte infiltration rate of pole pieces or diaphragms with different material systems and different process parameters must be different, so accurately detecting the electrolyte infiltration rate of a specific pole piece or diaphragm is helpful for reasonable battery design and performance improvement.

[0003] Traditional methods for detecting the electrolyte wetting rate mainly include the imbibition method (measuring the diffusion area of ​​the electrolyte on the electrode or diaphragm per unit time) and the weighing method (measuring the mass of electrolyte that can be absorbed by the electrode or diaphragm per unit volume). In fact, both the imbibition method and the weighing method are easily affected by environmental factors, and the operation is difficult to accurately control. The accuracy of the wetting rate detection results is low, and the reproducibility and consistency of the detection results are poor, and it is impossible to quantitatively analyze the wettability effect of the electrolyte on the electrode or diaphragm material. Utility Model Content

[0004] The utility model aims to provide an electrolyte infiltration rate testing mechanism to solve the problems existing in the prior art, utilize a capillary and a CCD camera to automatically detect the electrolyte infiltration rate in real time, and can adjust the verticality of the capillary in real time to ensure accuracy.

[0005] In order to achieve the above purpose, the solution of the utility model is:

[0006] A mechanism for testing electrolyte infiltration rate comprises a machine platform, a CCD camera, a rotating device, a detection bracket, a verticality adjustment device, a clamping device, a capillary, a secondary light source component and a sample stage; the CCD camera and the rotating device are both mounted on the machine platform; the detection bracket comprises a turntable driven to rotate by the rotating device, and a mounting frame integrally connected to the turntable; the verticality adjustment device is lifted and matched on the front side of the mounting frame and is coaxially arranged with the turntable; the clamping device is mounted at the axis center of the lower surface of the verticality adjustment device and is used to clamp the capillary; the secondary light source component is mounted on the side of the mounting frame; the sample stage is arranged on the turntable and is used to place a part to be detected.

[0007] The verticality adjustment device includes a first adjustment plate, a second adjustment plate, a third adjustment plate, and four groups of adjustment screws and adjustment springs; the first adjustment plate, the second adjustment plate and the third adjustment plate are arranged layer by layer from top to bottom, and the first adjustment plate is lifted and lowered in coordination with the side of the mounting frame, and the clamping device is installed at the axis center of the lower surface of the third adjustment plate; two adjustment screws are sequentially inserted into the first adjustment plate and the second adjustment plate at both ends of the first adjustment plate, and the other two adjustment screws are sequentially inserted into the second adjustment plate and the third adjustment plate at both sides of the first adjustment plate, and the adjustment spring is sleeved on the adjustment screw to provide a pre-tightening force.

[0008] Preferably, the upper surface of the second adjustment plate is provided with first limit blocks located on both sides of the first adjustment plate, and the upper surface of the third adjustment plate is provided with second limit blocks located on both ends of the first adjustment plate, which are respectively used to limit the movement of the first adjustment plate and the second adjustment plate.

[0009] Preferably, a lifting device is installed on the mounting frame, and the lifting device is used to drive the first adjustment plate to move up and down relative to the mounting frame.

[0010] Preferably, the lifting device includes a motor, a screw nut assembly and a transmission belt; the motor is arranged on the side of the mounting frame; the screw nut assembly is arranged in the mounting frame and fixedly connected to the side of the first adjustment plate; the transmission belt is transmission-connected between the output end of the motor and the end of the screw nut assembly.

[0011] The clamping device includes a chuck body and a clamping nut; the upper end of the chuck body is connected to the axis of the lower surface of the verticality adjustment device, and the lower end is provided with two symmetrically arranged clamping arms, and the opposite surfaces of the two clamping arms are provided with clamping grooves for accommodating the capillary, and the clamping grooves extend upward; the clamping nut is threadedly connected to the circumferential surface of the clamping arm to clamp the two clamping arms toward each other.

[0012] Preferably, a step is provided at the upper end of the clamping groove to limit the fitting depth of the capillary in the clamping groove.

[0013] Preferably, the step is provided with an air hole penetrating to the upper end surface of the chuck body.

[0014] The sample stage is provided with two mutually perpendicular reference surfaces.

[0015] The electrolyte infiltration rate testing mechanism also includes a linear guide rail and a liquid pipetting platform; the linear guide rail is arranged on the upper surface of the turntable, the sample stage and the liquid pipetting platform are both installed on the linear guide rail, and the linear guide rail is used to drive the sample stage and the liquid pipetting platform to move horizontally.

[0016] After adopting the above technical solution, the utility model has the following technical effects:

[0017] ① The utility model can realize that the entire detection process is automatically carried out by the testing mechanism, which can avoid errors caused by manual operation errors;

[0018] ② Through the capillary action of the capillary, when the liquid level changes, it is difficult for electrolyte to remain on the inner wall of the capillary, so the detection result is more accurate. In addition, the capillary is in contact with the object to be detected to achieve infiltration, and the electrolyte will only be transferred from the capillary to the object to be detected, which can ensure the detection accuracy.

[0019] ③ The CCD camera is used to capture and identify the liquid level data of the electrolyte in the capillary in real time. The CCD detection accuracy is high and the liquid level data of the electrolyte in the capillary can be accurately obtained, thereby effectively improving the accuracy of the wetting rate detection results of the pole piece to be tested, and making the reproducibility and consistency of the detection results better;

[0020] ④ After the capillary is installed on the clamping device, the rotating device can rotate the turntable of the detection bracket before the test to realize the rotation of the capillary, and then the CCD camera takes pictures of the capillary to detect its verticality in multiple directions, ensuring that the capillary is completely perpendicular to the sample stage and the test piece thereon, avoiding errors caused by the deflection of the capillary 7, and further ensuring the detection accuracy. If there is a problem with the verticality of the capillary, it can be adjusted through the verticality adjustment device to achieve the purpose of eliminating the error. The auxiliary light source component installed on the side of the mounting frame can provide fill light when necessary to improve accuracy;

[0021] ⑤ The pressure between the capillary and the object to be detected can be adjusted by lifting and lowering the verticality adjustment device on the side of the mounting frame. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 A three-dimensional diagram of a specific embodiment of the utility model Figure 1 ;

[0023] Figure 2 A three-dimensional diagram of a specific embodiment of the utility model Figure 2 ;

[0024] Figure 3 It is a front view of a specific embodiment of the utility model;

[0025] Figure 4 It is a rear view of a specific embodiment of the utility model;

[0026] Figure 5 A top view of a specific embodiment of the utility model;

[0027] Figure 6 for Figure 1 The enlarged view of point A in the middle;

[0028] Figure 7 A three-dimensional diagram of a sample stage of a specific embodiment of the utility model;

[0029] Figure 8 A cross-sectional view of a clamping device according to a specific embodiment of the utility model;

[0030] Description of Figure Numbers:

[0031] 1-machine platform; 2-CCD camera; 3-rotating device; 4-detection bracket; 41-turntable; 42-mounting frame; 5-vertical adjustment device; 51-first adjustment plate; 52-second adjustment plate; 521-first limit block; 53-third adjustment plate; 531-second limit block; 54-adjusting screw; 55-adjusting spring; 6-clamping device; 61-chuck body; 611-clamping arm; 612-clamping groove; 613-step; 614-air vent; 62-clamping nut; 7-capillary; 8-auxiliary light source component; 9-sample stage; 91-reference surface; 10-adjusting bracket; 20-lifting device; 201-motor; 202-screw nut assembly; 203-transmission belt; 30-guide rail assembly; 40-linear guide rail; 50-pipetting table. DETAILED DESCRIPTION

[0032] In order to further explain the technical solution of the present utility model, the present utility model is described in detail below through specific embodiments.

[0033] refer to Figures 1 to 8 As shown, the utility model discloses an electrolyte infiltration rate testing mechanism, including a machine platform 1, a CCD camera 2, a rotating device 3, a detection bracket 4, a verticality adjustment device 5, a clamping device 6, a capillary 7, a secondary light source component 8 and a sample stage 9;

[0034] The CCD camera 2 and the rotating device 3 are both installed on the machine platform 1;

[0035] The detection bracket 4 includes a turntable 41 driven to rotate by the rotating device 3, and a mounting frame 42 integrally connected to the turntable 41;

[0036] The verticality adjustment device 5 is lifted and matched on the front of the mounting frame 42 and is coaxially arranged with the turntable 41;

[0037] The clamping device 6 is installed at the axis center of the lower surface of the verticality adjustment device 5 and is used to clamp the capillary 7;

[0038] The auxiliary light source component 8 is mounted on the side of the mounting frame 42;

[0039] The sample table 9 is disposed on the turntable 41 and is used to place the object to be tested (generally a pole piece or a diaphragm).

[0040] Through the above scheme, the utility model can utilize the capillary 7 to absorb electrolyte and contact with the to-be-detected piece placed on the sample stage 9 for a certain period of time. Based on the diffusion mass transfer characteristics of the liquid phase under the capillary action, the to-be-detected piece absorbs the electrolyte to achieve infiltration. The amount of electrolyte absorbed by the to-be-detected piece is reflected by the change in the liquid level in the capillary 7. At the same time, the CCD camera 2 takes real-time photos to identify the change in the liquid level in the capillary 7. When the capillary 7 contacts with the to-be-detected piece for a preset period of time or when the real-time liquid level h in the capillary 7 is 0, the electrolyte infiltration rate of the test piece can be calculated according to the liquid level change value and the contact time value. The entire detection process is automatically performed by the testing mechanism, which can avoid errors caused by manual operation errors. Through the capillary action of the capillary 7, when the liquid level changes, it is difficult for the inner wall of the capillary 7 to have electrolyte residue, and the accuracy of the detection result is higher. In addition, the infiltration is achieved by the contact between the capillary 7 and the test piece, and the electrolyte will only be transferred from the capillary 7 to the test piece, which can ensure the detection accuracy. The CCD camera 2 takes real-time pictures. The liquid level data of the electrolyte in the capillary 7 is photographed and identified. The CCD detection accuracy is high and the liquid level data of the electrolyte in the capillary can be accurately obtained, thereby effectively improving the accuracy of the wetting rate detection result of the pole piece to be tested, and making the reproducibility and consistency of the detection result better; after the capillary 7 is installed on the clamping device 6, the rotating device 3 can rotate the turntable 41 of the detection bracket 4 before the test to realize the rotation movement of the capillary 7, and then the CCD camera 2 takes pictures of the capillary 7 to detect its verticality in multiple directions, ensuring that the capillary 7 is completely perpendicular to the sample stage 9 and the piece to be tested thereon, avoiding errors caused by the deflection of the capillary 7, and further ensuring the detection accuracy. If there is a problem with the verticality of the capillary 7, it can be adjusted by the verticality adjustment device 5 to achieve the purpose of eliminating the error. The auxiliary light source component 8 installed on the side of the mounting frame 42 can be used for fill light when necessary to improve the accuracy; the pressure between the capillary 7 and the piece to be tested can be adjusted by the lifting and lowering cooperation of the verticality adjustment device 5 on the side of the mounting frame 42.

[0041] A specific embodiment of the test mechanism is shown below.

[0042] The CCD camera 2 is installed on the upper surface of the machine platform 1 by adjusting the bracket 10 , and the height of the CCD camera 2 and the distance between the CCD camera 2 and the detection bracket 4 can be adjusted to ensure the recognition accuracy of the CCD camera 2 .

[0043] See also Figure 6The verticality adjustment device 5 comprises a first adjustment plate 51, a second adjustment plate 52, a third adjustment plate 53, and four groups of adjustment screws 54 and an adjustment spring 55; the first adjustment plate 51, the second adjustment plate 52 and the third adjustment plate 53 are arranged layer by layer from top to bottom, and the first adjustment plate 51 is lifted and lowered in coordination with the side of the mounting frame 42, and the clamping device 6 is installed at the axis of the lower surface of the third adjustment plate 53; two adjustment screws 54 are sequentially inserted into the first adjustment plate 51 and the second adjustment plate 52 at both ends of the first adjustment plate 51, and the other two adjustment screws 54 are sequentially inserted into the second adjustment plate 52 and the third adjustment plate 53 at both sides of the first adjustment plate 51, and the adjustment spring 55 is sleeved on each adjustment screw to provide a pre-tightening force to prevent the adjustment screw 54 from loosening. By adjusting one group of adjustment screws 54 (two on the same plane are one group), the relative angle between the two adjustment plates can be changed. In this way, the verticality of the capillary 7 can be adjusted separately in two vertical planes, which can be more direct, fast and accurate.

[0044] Furthermore, the upper surface of the second adjustment plate 52 is provided with a first limit block 521 located on both sides of the first adjustment plate 51, and the upper surface of the third adjustment plate 53 is provided with a second limit block 531 located on both ends of the first adjustment plate 51, which are used to limit the movement of the first adjustment plate 51 and the second adjustment plate 52 respectively.

[0045] At the same time, a lifting device 20 is installed on the mounting frame 42, and the lifting device 20 is used to drive the first adjustment plate 51 to move up and down relative to the mounting frame 42. In this embodiment, the lifting device 20 includes a motor 201, a screw nut assembly 202 and a transmission belt 203; the motor 201 is arranged on the side of the mounting frame 42 (located on the opposite side of the secondary light source component 8), and preferably has an acceleration and reduction gear; the screw nut assembly 202 is arranged in the mounting frame 42 and fixedly connected to the side of the first adjustment plate 51; the transmission belt 203 is transmission-connected between the output end of the motor 201 and the end of the screw nut assembly 202.

[0046] See also Figure 8 The clamping device 6 includes a chuck body 61 and a clamping nut 62; the upper end of the chuck body 61 is connected to the axis center of the lower surface of the verticality adjustment device 5 (that is, the third adjustment plate 53 mentioned above), and the lower end thereof is provided with two symmetrically arranged clamping arms 611, and the opposite surfaces of the two clamping arms 611 are provided with clamping grooves 612 for accommodating the capillary 7, and the clamping grooves 612 extend upward; the clamping nut 62 is threadedly connected to the circumferential surface of the clamping arms 611 so that the two clamping arms 611 are clamped toward each other, so that the capillary 7 can be fixed in the chuck body 61 to ensure the concentricity of the capillary 7 and the chuck body 61.

[0047] Furthermore, the upper end of the chuck body 61 is threadedly connected to the verticality adjustment device 5 for easy removal and replacement.

[0048] At the same time, a step 613 is provided at the upper end of the clamping groove 612 to limit the fitting depth of the capillary 7 in the clamping groove 612, so that the capillary 7 maintains a fixed exposed length after installation, thereby ensuring the consistency of the test conditions, and can play a supporting role when the capillary 7 presses down the test piece, so that it can be tested under a greater pressure. In this embodiment, a vent hole 614 is provided on the step 613 that penetrates to the upper end surface of the chuck body 61, so that the upper end of the capillary 7 can be connected to the atmosphere.

[0049] The auxiliary light source component 8 is installed on the side of the mounting frame 42 through a guide rail assembly 30 perpendicular to the front of the mounting frame 42, so that the position of the auxiliary light source component 8 can be adjusted to ensure that the auxiliary light source component 8 is coaxial with the CCD camera 2.

[0050] See also Figure 7 The sample stage 9 is provided with two mutually perpendicular reference surfaces 91, which serve as reference surfaces for the main viewing angle (the CCD camera 2 faces the front of the mounting bracket 42) and the side viewing angle (the mounting bracket 42 is rotated 90° relative to the main viewing angle), so as to facilitate the rapid placement of the test piece on the sample stage 9, so that there is a clear and fixed reference surface during the testing and debugging process.

[0051] The utility model also includes a linear guide rail 40 and a liquid pipetting platform 50; the linear guide rail 40 is arranged on the upper surface of the turntable 41, and the sample stage 9 and the liquid pipetting platform 50 are both installed on the linear guide rail 40. The linear guide rail 40 is used to drive the sample stage 9 and the liquid pipetting platform 50 to move horizontally so that they are aligned with the bottom of the capillary 7 to realize automatic liquid pipetting and start testing without manual capillary pipetting.

[0052] The utility model also discloses a method for testing the electrolyte infiltration rate, using the above-mentioned testing mechanism, comprising the following steps:

[0053] Step 1: Install the capillary 7 on the clamping device 6, and install the clamping device 6 on the verticality adjustment device 5;

[0054] Step 2: The detection bracket 4 is driven to rotate by the rotating device 3, and the verticality of the capillary 7 at multiple angles is photographed by the CCD camera 2; when the capillary 7 is not vertical at a certain angle, the verticality adjustment device 5 is operated to adjust the verticality;

[0055] Step 3: Place the object to be tested on the sample table 9, and lower the verticality adjustment device 5 to make the capillary 7 contact the object to be tested, and start the test;

[0056] Step 4: Use the CCD camera 2 to take real-time photos of the liquid level in the capillary 7 and record them;

[0057] Step 5: When the contact time between the capillary 7 and the object to be tested reaches a preset value, or the liquid level in the capillary 7 is 0, the test is terminated and the infiltration rate is calculated.

[0058] The above embodiments and drawings do not limit the product form and style of the present utility model. Any appropriate changes or modifications made by ordinary technicians in the relevant technical field should be deemed to be within the patent scope of the present utility model.

Claims

1. An electrolyte infiltration rate testing mechanism, characterized in that: It includes a machine platform, a CCD camera, a rotating device, a detection bracket, a vertical adjustment device, a clamping device, a capillary, a secondary light source component and a sample stage; The CCD camera and the rotating device are both installed on the machine platform; The detection bracket includes a turntable driven to rotate by the rotating device, and a mounting frame integrally connected to the turntable; The verticality adjustment device is lifted and matched on the front side of the mounting frame and is coaxially arranged on the turntable; The clamping device is installed at the axis center of the lower surface of the verticality adjustment device and is used to clamp the capillary tube; The auxiliary light source component is installed on the side of the mounting frame; The sample stage is arranged on the turntable and is used for placing the parts to be tested.

2. The electrolyte infiltration rate testing mechanism according to claim 1, characterized in that: The verticality adjustment device includes a first adjustment plate, a second adjustment plate, a third adjustment plate, and four groups of adjustment screws and adjustment springs; the first adjustment plate, the second adjustment plate and the third adjustment plate are arranged layer by layer from top to bottom, and the first adjustment plate is lifted and lowered in coordination with the side of the mounting frame, and the clamping device is installed at the axis center of the lower surface of the third adjustment plate; two adjustment screws are sequentially inserted into the first adjustment plate and the second adjustment plate at both ends of the first adjustment plate, and the other two adjustment screws are sequentially inserted into the second adjustment plate and the third adjustment plate at both sides of the first adjustment plate, and the adjustment spring is sleeved on the adjustment screw to provide a pre-tightening force.

3. The electrolyte infiltration rate testing mechanism according to claim 2, characterized in that: The upper surface of the second adjustment plate is provided with first limit blocks located on both sides of the first adjustment plate, and the upper surface of the third adjustment plate is provided with second limit blocks located on both ends of the first adjustment plate, which are respectively used to limit the movement of the first adjustment plate and the second adjustment plate.

4. The electrolyte infiltration rate testing mechanism according to claim 2, characterized in that: A lifting device is installed on the mounting frame, and the lifting device is used to drive the first adjustment plate to move up and down relative to the mounting frame.

5. The electrolyte infiltration rate testing mechanism according to claim 4, characterized in that: The lifting device includes a motor, a screw nut assembly and a transmission belt; the motor is arranged on the side of the mounting frame; the screw nut assembly is arranged in the mounting frame and fixedly connected to the side of the first adjustment plate; the transmission belt is transmission-connected between the output end of the motor and the end of the screw nut assembly.

6. The electrolyte infiltration rate testing mechanism according to claim 1, characterized in that: The clamping device includes a chuck body and a clamping nut; the upper end of the chuck body is connected to the axis of the lower surface of the verticality adjustment device, and the lower end is provided with two symmetrically arranged clamping arms, and the opposite surfaces of the two clamping arms are provided with clamping grooves for accommodating the capillary, and the clamping grooves extend upward; the clamping nut is threadedly connected to the circumferential surface of the clamping arm to clamp the two clamping arms toward each other.

7. The electrolyte infiltration rate testing mechanism according to claim 6, characterized in that: The upper end of the clamping groove is provided with a step for limiting the fitting depth of the capillary in the clamping groove.

8. The electrolyte infiltration rate testing mechanism according to claim 7, characterized in that: The step is provided with an air hole penetrating to the upper end surface of the chuck body.

9. The electrolyte infiltration rate testing mechanism according to claim 1, characterized in that: The sample stage is provided with two mutually perpendicular reference surfaces.

10. The electrolyte infiltration rate testing mechanism according to claim 1, characterized in that: It also includes a linear guide rail and a pipetting platform; the linear guide rail is arranged on the upper surface of the turntable, the sample platform and the pipetting platform are both installed on the linear guide rail, and the linear guide rail is used to drive the sample platform and the pipetting platform to move horizontally.

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