Coating diaphragm surface density testing device

Abstract

The utility model provides a coating diaphragm surface density testing device. The device is mainly composed of a workbench, a heating mechanism, a weighing balance and a three-axis manipulator. The heating mechanism comprises a heating platform and a fixing piece; the heating platform is located at the top of the workbench and horizontally and rotationally connected with the workbench, the fixing pieces are installed at the four corners of the top of the heating platform, and the movable ends of the fixing pieces move along the diagonal lines of the heating platform, make contact with the coating diaphragm and limit the coating diaphragm to the top of the heating platform. The weighing balance is placed at the top of the workbench and is positioned obliquely below the heating platform; the bottom projection of the heating platform in the inclined state is located in a weighing area of the weighing balance. The three-axis mechanical arm is installed on the top of the workbench, located above the heating platform and used for grabbing the wiping cloth and wiping the coating diaphragm limited on the top of the heating platform in a constant force mode. According to the utility model, the coating diaphragm is uniformly wiped by a machine, so that the diaphragm is not easy to break and wrinkle, and the stress concentration phenomenon caused by manual operation is effectively eliminated.

Description

Technical Field

[0001] This utility model relates to the field of battery coated separator technology, and in particular to a coated separator surface density testing device. Background Technology

[0002] The surface density test of the separator coating is a quality control step in the production of lithium-ion batteries. Currently, the surface density of the coating is mainly obtained by the manufacturer by testing the difference before and after the coating process. In battery factories, the overall surface density of the separator is mainly measured, while the surface density of the coating is difficult to measure and is difficult to measure accurately.

[0003] The current method involves manually wiping the separator with a surfactant-impregnated cotton material, calculating the areal density by weighing the difference in mass before and after coating. This method suffers from several technical drawbacks in practice: firstly, the uneven application of force during manual wiping can easily damage the separator's microstructure; secondly, the flexible separator is prone to irreversible wrinkling and deformation due to shear stress during wiping. These process defects not only affect the accuracy of the test data but also pose potential quality risks to subsequent battery assembly processes, hindering the large-scale production of battery products. Utility Model Content

[0004] Therefore, it is necessary to provide a coating diaphragm areal density testing device to address the problem that existing testing processes can easily damage the diaphragm.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0006] A coating diaphragm surface density testing device mainly consists of a worktable, a heating mechanism, a weighing balance, and a three-axis manipulator.

[0007] The heating mechanism includes a heating platform and fixing components; the heating platform is located on top of the workbench and is horizontally rotatably connected to it; the fixing components are installed at the four corners of the top of the heating platform; the movable ends of the fixing components move along the diagonal of the heating platform, contact the coating diaphragm, and confine it to the top of the heating platform.

[0008] The weighing balance is placed on top of the workbench and diagonally below the heating platform; the bottom projection of the tilted heating platform is located within the weighing area of ​​the weighing balance.

[0009] A three-axis robotic arm is mounted on top of the worktable and above the heating platform to grasp a wiping cloth and wipe the coating diaphragm, which is confined to the top of the heating platform, with constant force.

[0010] Furthermore, the heating mechanism also includes a drive unit; a drive unit for driving the heating platform to rotate clockwise or counterclockwise is installed on the top outer side of the worktable.

[0011] Furthermore, the heating platform includes a heat-conducting plate with a built-in array of distributed heating elements and a shaft running through the middle section of the heat-conducting plate. One end of the shaft is rotatably connected to the worktable, and the other end is connected to the output shaft of the drive unit.

[0012] Furthermore, the fixing components include a support block, a horizontal telescopic cylinder, a vertical micro cylinder, and a suction cup; the support block is fixedly installed at the top four corners of the heating platform, and the horizontal telescopic cylinder and the vertical micro cylinder serve as the movable ends of the fixing components. The fixed end of the horizontal telescopic cylinder is installed on the support block, and its telescopic direction is consistent with the diagonal direction of the heating platform. The movable end of the horizontal telescopic cylinder faces the center of the heating platform and is connected to the vertical micro cylinder, and the movable end of the vertical micro cylinder faces downward and is connected to the suction cup.

[0013] Furthermore, the fixing components include a linear slide module, a longitudinal cylinder, and a pressure plate; openings are made at the four corners of the heating platform along their diagonals, the longitudinal cylinder is located in the openings with its movable end facing upwards, the pressure plate is located above the heating platform and connected to the movable end of the longitudinal cylinder, the linear slide module is installed at the bottom of the heating platform along the opening trajectory, and the fixed end of the longitudinal cylinder is connected to the movable end of the linear slide module.

[0014] Furthermore, an anti-slip cloth is provided on one side of the pressure plate that adheres to the coated diaphragm.

[0015] Furthermore, the size of the heating platform is at least 1.5 times the size of the coated diaphragm.

[0016] Furthermore, a shelf is placed on top of the weighing balance, which serves as the weighing area of ​​the balance and overlaps with the bottom projection of the tilted heating platform.

[0017] Furthermore, a cam elastic element is provided below the heating platform. The cam elastic element is installed on the inner side of the top of the worktable, and the movable end of the cam elastic element is in contact with the side of the inclined heating platform.

[0018] Furthermore, a vibration motor is installed below the heating platform. The vibration motor is mounted on the inner top of the workbench, and the movable end of the vibration motor is in contact with the side of the inclined heating platform.

[0019] Compared with the prior art, the beneficial effects of this utility model include:

[0020] 1. By wiping the coated diaphragm with uniform force by machine, it is not easy to tear or wrinkle the diaphragm, effectively eliminating stress concentration caused by manual operation;

[0021] 2. It has a built-in heating structure that can evaporate the surfactant before weighing, avoiding the impact of back-and-forth transfer and surfactant residue on the results. Attached Figure Description

[0022] The disclosure of this utility model is illustrated with reference to the accompanying drawings. It should be understood that the drawings are for illustrative purposes only and are not intended to limit the scope of protection of this utility model. In the drawings, the same reference numerals are used to refer to the same parts. Wherein:

[0023] Figure 1 This is a perspective view of a coating diaphragm surface density testing device according to Embodiment 1 of this utility model;

[0024] Figure 2 Based on Figure 1 A front view of a coating diaphragm surface density testing device;

[0025] Figure 3 For based on Figure 1 A top view of a coating diaphragm surface density testing device;

[0026] Figure 4 For based on Figure 1 A structural schematic diagram of the fastener;

[0027] Figure 5 This is a structural schematic diagram of the fastener described in Example 2.

[0028] The following components are labeled in the diagram: 1. Workbench; 2. Heating mechanism; 21. Heating platform; 22. Fixing component; 221. Support block; 222. Horizontal telescopic cylinder; 223. Longitudinal miniature cylinder; 224. Suction cup; 225. Linear slide module; 226. Longitudinal cylinder; 227. Pressure plate; 23. Driving component; 3. Weighing balance; 4. Three-axis robot; 5. Cam elastic component. Detailed Implementation

[0029] It is readily understood that, based on the technical solution of this utility model, those skilled in the art can propose various interchangeable structural methods and implementations without altering the essential spirit of this utility model. Therefore, the following detailed embodiments and accompanying drawings are merely illustrative descriptions of the technical solution of this utility model and should not be considered as the entirety of this utility model or as limitations or restrictions on the technical solution of this utility model.

[0030] Example 1

[0031] like Figure 1 As shown in the figure, this embodiment introduces a coating diaphragm surface density testing device, which mainly consists of a worktable 1, a heating mechanism 2, a weighing balance 3, and a three-axis robot 4.

[0032] The workbench 1 includes a base and side panels. The side panels are bolted to the top of the base and form a rectangle. One of the side panels is hinged and can be opened as a movable door to easily observe the interior of the side panel. In practical applications, a top baffle can also be added to house the heating mechanism 2, the weighing balance 3, and the three-axis robot 4 in a relatively enclosed space.

[0033] like Figure 2 and Figure 3 As shown, the heating mechanism 2 includes a heating platform 21, a fixing member 22, and a driving member 23. The heating platform 21 is made entirely of an insulating and thermally conductive material, forming a heat-conducting plate. It contains an array of internally distributed heating elements. After the heating elements conduct electricity, heat is transferred to the top surface of the heating platform 21, thereby heating and drying the coating membrane that is attached to it, evaporating the surfactant in the coating membrane, and preventing surfactant residue from affecting the results. The heat-conducting plate has a transverse shaft inside, with its end located outside the heat-conducting plate. The end of the shaft is connected to a side baffle bearing. The driving member 23 drives the shaft to rotate the heating platform 21.

[0034] The drive unit 23 can be directly driven by a motor or synchronously driven, i.e., the motor and shaft are driven by a synchronous belt and synchronous pulley. The drive unit 23 drives the heating platform 21 to rotate in the direction of the weighing balance 3. The motor is a servo motor. To ensure the horizontality of the heating platform 21, a limit cylinder is installed inside the side baffle. The movable end of the limit cylinder faces downward, and a groove adapted to the end of the limit cylinder is opened on the shaft. That is, the end of the limit cylinder is located in the groove of the shaft, and the heating platform 21 remains horizontal. When the limit cylinder retracts, the end disengages from the shaft, and the heating platform 21 can be driven to rotate by the drive unit 23.

[0035] like Figure 4As shown, the fixing component 22 mainly includes a support block 221, a horizontal telescopic cylinder 222, a vertical micro cylinder 223, and a suction cup 224. The support block 221 is fixedly installed at the four corners of the top of the heating platform 21, facing the longitudinal center of the heating platform 21. The horizontal telescopic cylinder 222 and the vertical micro cylinder 223 serve as the movable ends of the fixing component 22. The fixed end of the horizontal telescopic cylinder 222 is installed on the support block 221, and the telescopic direction of the horizontal telescopic cylinder 222 is located diagonally along the heating platform 21. The movable end of the horizontal telescopic cylinder 222 faces the center of the heating platform 21 and is connected to the vertical micro cylinder 223. The movable end of the vertical micro cylinder 223 faces downward and is connected to the suction cup 224. The horizontal telescopic cylinder 222 moves the suction cup 224 onto the coating membrane, and the vertical micro cylinder 223 moves downward to make the suction cup 224 contact the coating membrane and fix it. The four fixing mechanisms fix the four corners of the coating membrane, making the coating membrane adhere to the heating platform 21. In order to fully dry the coated diaphragm, the size of the heating platform 21 is much larger than the size of the coated diaphragm, at least 1.5 times.

[0036] The weighing balance 3 is placed on top of the workbench 1 and diagonally below the heating platform 21; the bottom projection of the tilted heating platform 21 is located within the weighing area of ​​the weighing balance 3. Since the overall size of the weighing balance 3 is smaller than that of the heating platform 21, a shelf is placed on top of the weighing balance 3 to fully catch any powder falling from the heating platform 21. This shelf expands the weighing area of ​​the weighing balance 3, covering the bottom projection of the tilted heating platform 21. It should be noted that the weighing balance 3 used in this embodiment is a laboratory-grade electronic balance with an accuracy of at least 0.001g, meeting the accuracy requirements for powder measurement.

[0037] To ensure that the powder on top of the tilted heating platform 21 falls onto the weighing balance 3, a cam elastic element 5 is installed below the heating platform 21. The cam elastic element 5 is mounted on the side baffle. When the heating platform 21 rotates and tilts, the cam elastic element 5 continuously strikes the heating platform 21, vibrating and dislodging the powder on the heating platform 21. The cam elastic element 5 uses an existing structure: a motor-driven cam, which engages with a spring telescopic structure, causing the end of the spring telescopic structure to periodically strike the heating platform 21, thus vibrating and dislodging the powder on the heating platform 21.

[0038] The three-axis robotic arm 4 is mounted on the top of the side panel. The three-axis robotic arm 4 can grasp a clean cloth with surfactant and wipe the coated partition on the top surface of the heating platform 21.

[0039] The specific steps are as follows:

[0040] First, weigh the entire diaphragm (m1). Place the diaphragm on the heating platform 21 and fix it with the fixing member 22. The three-axis robot 4 applies a constant force with a lint-free cloth containing surfactant to wipe it until it is clean. Start the heating platform 21 to heat it and evaporate the surfactant completely. If there is powder falling on the surface of the heating platform 21, drive the heating platform 21 to rotate with the drive member 23. Then, cause the cam elastic member 5 to hit the heating platform 21, causing the powder to fall onto the weighing balance 3. The weight of the powder is measured as m2 (if there is no powder, it is not measured). Weigh the diaphragm after drying (m3). The weight of the coating on one side of the diaphragm is m1-(m2+m3).

[0041] If the other side of the diaphragm also has a coating, flip the diaphragm to the other side, and the three-axis robot 4 applies a constant force with a clean cloth containing surfactant to wipe it until it is clean. Turn on the heating platform 21 to heat it and evaporate the surfactant completely. Weigh the dried diaphragm and the weight m4. Then the mass of the coating on the other side is m3 + m2 - m4.

[0042] In this embodiment, the coated diaphragm is wiped with uniform force by machine, which is less likely to tear or wrinkle the diaphragm and effectively eliminates stress concentration caused by manual operation; it has a built-in heating structure that can evaporate the surfactant before weighing, avoiding the back-and-forth transfer process and surfactant residue affecting the results.

[0043] Example 2

[0044] like Figure 5 As shown, this embodiment introduces a coating diaphragm surface density testing device, which has a basically the same structure as the coating diaphragm surface density testing device introduced in Embodiment 1. The difference is that the fixing component 22 in this embodiment mainly consists of a linear slide module 225, a longitudinal cylinder 226, and a pressure plate 227. Openings are made at the four corners of the heating platform 21 along its diagonal. The longitudinal cylinder 226 is located inside the opening with its movable end facing upwards. The pressure plate 227 is located above the heating platform 21 and connected to the movable end of the longitudinal cylinder 226. The linear slide module 225 is installed at the bottom of the heating platform 21 along the opening trajectory, and the fixed end of the longitudinal cylinder 226 is connected to the movable end of the linear slide module 225. The linear slide module 225 drives the longitudinal cylinder 226 to move within the opening. An anti-slip cloth is provided on the side of the pressure plate 227 that is in contact with the coating diaphragm to prevent the pressure plate 227 from damaging the diaphragm.

[0045] After the coated diaphragm is placed on the top surface of the heating platform 21, the linear slide module 225 drives the longitudinal cylinder 226 to move closer to the coated diaphragm, and then the longitudinal cylinder 226 shrinks the pressure plate 227 to move down and fit the coated diaphragm, thus fixing the coated diaphragm.

[0046] This embodiment has the same beneficial effects as Embodiment 1.

[0047] Example 3

[0048] This embodiment introduces a coating diaphragm surface density testing device, which is basically the same in structure as the coating diaphragm surface density testing device introduced in Embodiment 1. The difference is that this embodiment uses a vibration motor to vibrate the heating platform 21. A vibration motor is installed below the heating platform 21, and the vibration motor is mounted on the inner top of the workbench 1. The movable end of the vibration motor is in contact with the side of the inclined heating platform 21. When the heating platform 21 is rotated to an inclined state, the vibration motor vibrates the heating platform 21, thereby causing the powder on the heating platform 21 to fall onto the weighing balance 3.

[0049] This embodiment has the same beneficial effects as Embodiment 1.

[0050] The technical scope of this utility model is not limited to the content described above. Those skilled in the art can make various modifications and variations to the above embodiments without departing from the technical concept of this utility model, and all such modifications and variations should fall within the protection scope of this utility model.

Claims

1. A coated separator areal density testing device characterized by, It includes: Workbench (1); Heating mechanism (2) including heating platform (21) and fixing piece (22); heating platform (21) is located on the top of workbench (1) and is horizontally connected with it, fixing piece (22) is installed on the top of heating platform (21) four corners, the movable end of fixing piece (22) is along the diagonal of heating platform (21) and is in contact with the coating diaphragm and limits it on the top of heating platform (21); Weighing balance (3) is placed on the top of workbench (1) and is located obliquely below heating platform (21); the bottom projection of heating platform (21) in inclined state is located in the weighing area of weighing balance (3); Three-axis mechanical hand (4) is installed on the top of workbench (1) and is located above heating platform (21), which is used to grab the wiping cloth and wipe the coating diaphragm limited on the top of heating platform (21) with constant force.

2. The coated separator areal density test device of claim 1, wherein, The heating mechanism (2) further comprises a driving member (23); the top outside of the workbench (1) is provided with a driving member (23) for driving the heating platform (21) to rotate clockwise or counterclockwise.

3. The coated separator areal density test device of claim 2, wherein, The heating platform (21) comprises a heat-conducting plate with built-in array distribution of electric heating elements and a shaft rod transversely crossing the middle section of the heat-conducting plate, the end of the shaft rod is rotatably connected with the workbench (1), and one end is connected with the output shaft of the driving member (23).

4. The coated separator areal density test device of claim 1, wherein, The fixing piece (22) comprises a support block (221), a horizontal telescopic cylinder (222), a longitudinal micro cylinder (223) and a suction cup (224); the support block (221) is fixedly arranged on the top of the heating platform (21) four corners, the horizontal telescopic cylinder (222) and the longitudinal micro cylinder (223) are used as the movable end of the fixing piece (22), the fixed end of the horizontal telescopic cylinder (222) is installed on the support block (221), and the telescopic direction is consistent with the diagonal direction of the heating platform (21), the movable end of the horizontal telescopic cylinder (222) faces the center of the heating platform (21) and is connected with the longitudinal micro cylinder (223), and the movable end of the longitudinal micro cylinder (223) faces downward and is connected with the suction cup (224).

5. The coated separator areal density test device of claim 1, wherein, The fixing piece (22) comprises a linear slide module (225), a longitudinal cylinder (226) and a pressing plate (227); the four corners of the heating platform (21) are provided with openings along the diagonal direction, the longitudinal cylinder (226) is located in the opening and the movable end faces upward, the pressing plate (227) is located above the heating platform (21) and is connected with the movable end of the longitudinal cylinder (226), and the linear slide module (225) is installed on the heating platform (21) along the opening track, and the fixed end of the longitudinal cylinder (226) is connected with the movable end of the linear slide module (225).

6. The coated separator areal density test device of claim 5, wherein, The side of the pressing plate (227) in contact with the coating diaphragm is provided with a non-slip cloth.

7. The coated separator face density test device of claim 1, wherein, The size of the heating platform (21) is at least 1.5 times the size of the coating diaphragm.

8. The coated separator areal density test device of claim 1, wherein, A placing plate is placed on the top of the weighing balance (3), and the placing plate is used as the weighing area of the weighing balance (3) and overlaps with the bottom projection of the heating platform (21) in inclined state.

9. The coated separator face density test device of claim 1, wherein, The lower portion of the heating platform (21) is provided with a cam elastic member (5), which is installed on the inner side of the top of the workbench (1), and the movable end of the cam elastic member (5) is in contact with the side of the heating platform (21) in the inclined state.

10. The coated separator areal density test device of claim 1, wherein, The lower portion of the heating platform (21) is provided with a vibration motor, which is installed on the inner side of the top of the workbench (1), and the movable end of the vibration motor is in contact with the side of the heating platform (21) in the inclined state.

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