Tool for detecting holes in surface of diaphragm

Abstract

The utility model discloses a tool for detecting holes in the surface of a diaphragm, and relates to the technical field of battery diaphragm detection, an unfolding mechanism comprises a feeding roller and a receiving roller, the feeding roller and the receiving roller are feeding assemblies of two groups of curled rollers, and the battery diaphragm is wound on the outer side of the feeding roller and the outer side of the receiving roller respectively; and the detection mechanism comprises a backlight assembly and a high-speed camera, and the light source is projected on the diaphragm through the backlight assembly and passes through the diaphragm to be received by the high-speed camera. The detection process comprises the steps of diaphragm unwinding, air blowing, CCD detection, marking and diaphragm winding, battery diaphragms are wound on the outer sides of the feeding roller and the receiving roller respectively, foreign matter and dust on the surfaces of incoming diaphragms are cleaned through the two air blowing pipelines, and the diaphragm winding is completed. The light source is projected on the diaphragm through the backlight assembly and passes through the high-speed camera to be received, so that the condition of the diaphragm pinhole is identified and the bad position is marked, and the high-efficiency detection of the diaphragm pinhole fault is realized.

Description

Technical Field

[0001] The utility model relates to the technical field of battery diaphragm detection, in particular to a tool for detecting holes on the surface of a diaphragm. Background Art

[0002] In the lithium-ion battery production process, the separator, one of the four main materials, plays a crucial role. A battery separator, a layer of membrane material between the positive and negative electrodes, is a critical component of the battery, directly impacting safety and cost. Its primary function is to isolate the positive and negative electrodes, preventing electrons from freely passing through the battery while allowing ions in the electrolyte to flow freely between the positive and negative electrodes. The ionic conductivity of the separator is directly related to the overall battery performance. Its isolation of the positive and negative electrodes limits the increase in current during overcharge or elevated temperatures, preventing explosions caused by short circuits.

[0003] Compared with other main materials, the diaphragm is more fragile and easily damaged. Due to abnormal raw materials or foreign matter on the diaphragm roller during lamination, pinholes may appear in the diaphragm. Diaphragms with pinholes will cause the battery to short-circuit, posing a major safety hazard. For micro-short-circuit batteries, the breakdown point is often very small and difficult to detect. For this reason, we propose a tool for detecting holes on the diaphragm surface. Utility Model Content

[0004] (1) Technical problems solved

[0005] In view of the deficiencies of the existing technology, the utility model provides a tool for detecting holes on the surface of a diaphragm, which solves the technical problem of diaphragm pinhole detection.

[0006] (2) Technical solution

[0007] In order to achieve the above objectives, the present invention is implemented through the following technical solutions:

[0008] A tool for detecting holes on the surface of a diaphragm, comprising

[0009] The unfolding mechanism includes a feeding roller and a receiving roller. The feeding roller and the receiving roller are the feeding components of two sets of winding rollers. The battery diaphragm is wound on the outside of the feeding roller and the receiving roller respectively to complete the unfolding of the diaphragm, which is convenient for subsequent inspection.

[0010] The detection mechanism includes a backlight component and a high-speed camera. The backlight component projects light onto the diaphragm and the light is received by the high-speed camera to identify the pinholes in the diaphragm and mark the defective positions.

[0011] Preferably, a marking mechanism is further included, which is divided into two parts: a tape unwinding structure and a glue pressing structure. The main purpose of the tape unwinding structure is to place the tape and unwind the tape as the tape is used.

[0012] The glue pressing structure has the functions of glue pressing and glue pulling. Gluing is to stick the tape to the defective position that needs to be marked. Pulling is to pull the tape back after glue pressing to prepare glue on the previous position. At the same time, a signal receiver is set inside the glue pressing mechanism to receive the signal from the high-speed camera to identify the defective position.

[0013] After receiving the bad signal from the high-speed camera, the tape is moved and attached to the surface of the diaphragm, realizing the function of marking the bad position identified by the CCD with the marking tape.

[0014] Preferably, it also includes a blowing mechanism, which includes two blowing pipes arranged on the upper and lower sides of the inner side of the partition arranged in the feeding direction of the backlight component to clean foreign matter and dust on the surface of the diaphragm material to prevent foreign matter and dust on the surface of the diaphragm from causing misjudgment of subsequent CCD results.

[0015] Preferably, the backlight assembly is a set of hollow two-side partitions, wherein the lower layer is a light-emitting plate for releasing light source, and the light shines on the surface of the membrane, and the membrane surface presents different states, and the upper layer is a transparent plate.

[0016] The high-speed camera uses a CCD camera to detect the surface of the diaphragm, and identifies the pinhole situation of the diaphragm according to the different threshold values of the surface of the image taken by the CCD camera.

[0017] Preferably, the feeding roller and the receiving roller are both connected to an external drive motor for driving the rotation to complete the unfolding and automatic winding of the diaphragm and to organize the diaphragm.

[0018] Preferably, the loading roller, marking mechanism, and receiving roller are all connected to the tooling body, the blowing mechanism is installed on the side of the light source panel and the shell cover, the backlight assembly and the shell cover are connected to the tooling body through a support frame, and the high-speed camera is connected to the tooling body through a bracket.

[0019] Preferably, the blowing mechanism is divided into two structures, an upper blowing structure and a lower blowing structure, wherein the upper blowing structure is connected to the leftmost side of the shell cover, and the lower blowing structure is connected to the leftmost side of the light source board. The upper and lower blowing structures are respectively connected to vacuum pipelines and connected to an external air pump to supply air to the diaphragm. The air pressure of the blowing is adjusted by the air pump. When the tooling starts to run, the upper and lower blowing structures will start blowing at the same time after the diaphragm passes through. The blowing direction of the blowing mechanism is adjustable. The wind blown out by the upper and lower blowing structures is blown toward the surface of the diaphragm to remove foreign matter attached to the surface of the future diaphragm and dust stuck in the air, so that when the diaphragm is subsequently subjected to CCD detection, the image formed by the CCD will not be interfered by foreign matter, which will cause misjudgment of the result.

[0020] (3) Beneficial effects

[0021] Testing process: diaphragm unwinding --- air blowing --- CCD detection --- marking --- diaphragm winding,

[0022] The battery diaphragm is wound around the outside of the feeding roller and the receiving roller respectively to complete the unfolding of the diaphragm, which is convenient for subsequent inspection; the two air blowing pipes clean the foreign matter and dust on the surface of the diaphragm material to prevent the foreign matter and dust on the surface of the diaphragm from causing misjudgment of the subsequent CCD results; the light source is projected onto the diaphragm through the backlight component and received by the high-speed camera to identify the pinhole situation of the diaphragm and mark the bad position. After receiving the bad signal from the high-speed camera, the tape is moved and pasted on the surface of the diaphragm to realize the function of marking the bad position identified by the CCD with the marking tape. Finally, the diaphragm is wound up by the cooperation of the feeding roller and the receiving roller to realize efficient detection of diaphragm pinhole faults. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention and to implement it according to the contents of the specification, the following is a detailed description of the preferred embodiments of the present invention in conjunction with the accompanying drawings.

[0024] Figure 1 This is a three-dimensional structural diagram of a tool for detecting holes on the surface of a diaphragm according to the present utility model;

[0025] Figure 2 This is a side structural diagram of a tool for detecting holes on the surface of a diaphragm according to the present utility model;

[0026] Figure 3 This is a top view of the structure of a tool for detecting holes on the surface of a diaphragm according to the present invention.

[0027] Legend: 1. Loading roller; 2. Air blowing mechanism; 3. Backlight assembly; 4. High-speed camera; 5. Marking mechanism; 6. Receiving roller. DETAILED DESCRIPTION

[0028] The embodiment of the present application solves the problem of detecting pinholes in battery diaphragms in the prior art by providing a tool for detecting holes on the surface of the diaphragm. During the expansion of the diaphragm, a high-speed camera is used in conjunction with a back light source to detect possible pinhole problems in the diaphragm. The technology realizes the detection of small pinhole faults in the diaphragm.

[0029] Example 1

[0030] like Figure 1-3 As shown, the technical solution in the embodiment of the present application is to solve the above-mentioned problem of detecting pinholes in the battery separator. The overall idea is as follows:

[0031] Aiming at the problems existing in the prior art, the utility model provides a tool for detecting holes on the surface of a diaphragm, comprising

[0032] The unfolding mechanism includes a feeding roller 1 and a receiving roller 6. The feeding roller 1 and the receiving roller 6 are feeding components of two sets of winding rollers. The battery diaphragm is wound around the outside of the feeding roller 1 and the receiving roller 6 respectively to complete the unfolding of the diaphragm, which is convenient for subsequent inspection.

[0033] The detection mechanism includes a backlight assembly 3 and a high-speed camera 4. The backlight assembly 3 projects light onto the diaphragm and the light is received by the high-speed camera 4 to identify the pinhole condition of the diaphragm and mark the defective position.

[0034] The marking mechanism 5 is further comprised. The marking mechanism 5 is divided into two parts: a tape unwinding structure and a glue pressing structure. The main purpose of the tape unwinding structure is to place the tape and unwind the tape as it is used.

[0035] The glue pressing structure has the functions of glue pressing and glue pulling. Gluing is to stick the tape to the defective position that needs to be marked. Pulling is to pull the tape back after glue pressing to prepare glue on the previous position. At the same time, a signal receiver is set inside the glue pressing mechanism to receive the signal sent by the high-speed camera 4 to identify the defective position.

[0036] After receiving the bad signal from the high-speed camera 4, the tape is moved and pasted on the surface of the diaphragm, thereby realizing the function of marking the bad position identified by the CCD with the marking tape.

[0037] The backlight assembly 3 is a set of hollow two-side partitions, the lower layer of which is a light-emitting plate for releasing light. When light shines on the surface of the membrane, the membrane surface presents different states. The upper layer is a transparent plate.

[0038] The high-speed camera 4 uses a CCD camera to detect the surface of the diaphragm, and identifies the pinhole situation of the diaphragm according to the different threshold values of the surface of the image taken by the CCD camera.

[0039] The feeding roller 1 and the receiving roller 6 are both connected to an external driving motor for driving the rotation to complete the unfolding and automatic winding of the diaphragm and to arrange the diaphragm.

[0040] The feeding roller 1, marking mechanism 5, and receiving roller 6 are all connected to the tooling body, the blowing mechanism 2 is installed on the side of the light source board and the shell cover, the backlight assembly 3 and the shell cover are connected to the tooling body through the support frame, and the high-speed camera 4 is connected to the tooling body through the bracket.

[0041] Example 2

[0042] Based on Example 1, during the production and deployment of the diaphragm, foreign matter attached to the diaphragm surface and dust in the air may interfere with the image formed by the CCD during subsequent CCD detection, causing misjudgment of the result and affecting the accuracy of the detection mechanism. The overall idea is as follows:

[0043] The device also includes a blowing mechanism 2, which includes two blowing pipes arranged on the upper and lower sides of the inner side of the partition in the feeding direction of the backlight assembly 3, to clean foreign matter and dust on the surface of the membrane material to prevent foreign matter and dust on the membrane surface from causing misjudgment of subsequent CCD results.

[0044] The blowing mechanism 2 is divided into two structures, an upper blowing structure and a lower blowing structure, wherein the upper blowing structure is connected to the leftmost side of the shell cover, and the lower blowing structure is connected to the leftmost side of the light source board. The upper and lower blowing structures are respectively connected to vacuum pipelines and communicated with an external air pump to supply air to the diaphragm. The air pressure of the blowing is adjusted by the air pump. When the tooling starts to run, the upper and lower blowing structures will start blowing at the same time after the diaphragm passes through. The blowing direction of the blowing mechanism is adjustable. The wind blown out by the upper and lower blowing structures is blown toward the surface of the diaphragm to remove foreign matter attached to the surface of the future diaphragm and dust stuck in the air, so that when the diaphragm is subsequently subjected to CCD detection, the image formed by the CCD will not be interfered by foreign matter, which will cause misjudgment of the result.

[0045] process:

[0046] Diaphragm unwinding---air blowing---CCD detection---marking---diaphragm rewinding.

[0047] Finally, it should be noted that the above embodiments are merely examples for the purpose of illustrating the present invention and are not intended to limit the embodiments. Those skilled in the art will readily appreciate that other variations or modifications based on the above description are possible. It is not necessary and impossible to provide an exhaustive list of all possible embodiments. However, any obvious variations or modifications arising therefrom remain within the scope of protection of the present invention.

Claims

1. A tool for detecting holes on the surface of a diaphragm, characterized by: The unfolding mechanism comprises a feeding roller (1) and a receiving roller (6), wherein the feeding roller (1) and the receiving roller (6) are feeding components of two groups of winding rollers, and the battery diaphragm is wound around the outside of the feeding roller (1) and the receiving roller (6) respectively; The detection mechanism includes a backlight assembly (3) and a high-speed camera (4). The backlight assembly (3) projects a light source onto the diaphragm and the light is received by the high-speed camera (4). The pinhole condition of the diaphragm is identified and the defective position is marked.

2. The tool for detecting holes on the surface of a diaphragm according to claim 1, characterized in that: The device further comprises a marking mechanism (5), which is divided into two parts: a tape unwinding structure and a glue pressing structure. The main purpose of the tape unwinding structure is to place the tape and unwind the tape as the tape is used. The glue pressing structure has the functions of glue pressing and glue pulling. Gluing is to stick the tape to the bad position that needs to be marked. Pulling is to pull the tape backward after glue pressing and prepare glue at the previous position. At the same time, a signal receiver is set inside the glue pressing mechanism. After receiving the bad signal sent by the high-speed camera (4), the tape is moved and stuck on the surface of the diaphragm.

3. The tool for detecting holes on the surface of a diaphragm according to claim 1, characterized in that: It also includes an air blowing mechanism (2), which includes two air blowing pipes arranged on the upper and lower sides of the inner side of a partition arranged in the feeding direction of the backlight assembly (3).

4. The tool for detecting holes on the surface of a diaphragm according to claim 1, characterized in that: The backlight assembly (3) is a set of hollow two-side partitions, wherein the lower layer is a light-emitting plate and the upper layer is a transparent plate. The high-speed camera (4) uses a CCD camera to detect the surface of the membrane, and identifies the situation of the membrane pinhole according to the different surface thresholds of the image taken by the CCD camera.

5. The tool for detecting holes on the surface of a diaphragm according to claim 1, characterized in that: The feeding roller (1) and the receiving roller (6) are both connected to an external driving motor.

6. The tool for detecting holes on the surface of a diaphragm according to claim 5, characterized in that: The feeding roller (1), marking mechanism (5), and receiving roller (6) are all connected to the tooling body; the blowing mechanism (2) is installed on the side of the light source plate and the shell cover; the backlight assembly (3) and the shell cover are connected to the tooling body through a support frame; and the high-speed camera (4) is connected to the tooling body through a bracket.

7. The tool for detecting holes on the surface of a diaphragm according to claim 3, characterized in that: The blowing mechanism (2) is divided into two structures, an upper blowing structure and a lower blowing structure, wherein the upper blowing structure is connected to the leftmost side of the shell cover, and the lower blowing structure is connected to the leftmost side of the light source board. The upper and lower blowing structures are respectively connected to vacuum pipelines and communicated with an external air pump.

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