Non-destructive diaphragm weak point detection device

Abstract

The utility model discloses a non-destructive diaphragm weak point detection device which comprises a power device and a detection device, wherein the detection device comprises electrode plates arranged on the two sides of the diaphragm, the power device drives the diaphragm to pass through the electrode plates, and the detection device detects the weak point of the diaphragm by using the pressure difference change of the electrode plates on the two sides of the diaphragm. The diaphragm is guided to move at a constant speed, the electrode plates are arranged on the two sides of the diaphragm, the possible defects such as holes, cracks and coating omission of the diaphragm are found by detecting the change of the pressure difference of the electrode plates when the diaphragm passes, the diaphragm cannot be damaged in the testing process, and non-destructive diaphragm weak point detection is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of battery diaphragm detection, in particular to a non-destructive diaphragm weak point detection device. Background Art

[0002] During the diaphragm production process, various defects such as holes, cracks, and coating leaks may occur due to various reasons, such as equipment failure, raw material problems, or operational errors. The existence of these defects not only affects the quality and performance of the diaphragm, but may also have adverse effects on subsequent processing and use. Therefore, it is very important to detect weak points in the diaphragm.

[0003] Traditional methods for detecting weak points in diaphragms mostly rely on destructive testing methods, such as electrical weakness testing and breakdown voltage testing. These methods damage the diaphragm during testing and are a random inspection method that cannot reflect the true condition of untested diaphragms. Therefore, the development of a non-destructive diaphragm weak point detection device is of great significance.

[0004] Patent document with application number 202322559615.5 discloses a detection device for detecting battery diaphragms. The detection device provided by the solution can control the pressure of the pressure regulating chamber so that one side of the diaphragm is subjected to pressure. When the micro-perforation is relatively large, the detection liquid on the other side of the diaphragm will produce bubbles at the micro-perforation. It can quickly, accurately and efficiently determine whether the diaphragm has micro-perforations and determine the location of the micro-perforations. The detection cost is low, the detection is fast and efficient, and the detection results are reliable.

[0005] However, the solution also has the problem that the structure is relatively complex and it is not easy to implement the detection problem of diaphragm assembly line operation. Utility Model Content

[0006] In view of the above problems, the purpose of the present invention is to provide a non-destructive diaphragm weak point detection device to achieve non-destructive detection of diaphragm weak points.

[0007] The purpose of the utility model can be achieved by the following technical solutions: a non-destructive diaphragm weak point detection device, including a power device and a detection device;

[0008] Among them, the detection device includes electrode plates arranged on both sides of the diaphragm, the power device drives the diaphragm through the electrode plates, and the detection device uses the pressure difference change of the electrode plates on both sides of the diaphragm to detect the weak points of the diaphragm.

[0009] Furthermore, the power device includes an unwinding roller and a winding roller;

[0010] Among them, after the diaphragm is loaded, it travels around the roller surfaces of the unwinding roller and the winding roller at a uniform speed. Electrode plates are provided on both sides of the diaphragm between the unwinding roller and the winding roller.

[0011] Furthermore, the power device further comprises a guide roller group, wherein the guide roller group comprises a first guide roller, a second guide roller and a third guide roller;

[0012] The first guide roller is close to the unwinding roller, the third guide roller is close to the winding roller, and the second guide roller is staggered between the first guide roller and the third guide roller;

[0013] After the diaphragm is loaded, it moves at a uniform speed around the roller surfaces of the unwinding roller, the first guide roller, the second guide roller, the third guide roller and the winding roller;

[0014] Electrode plates are provided on both sides of the diaphragm between the first guide roller and the second guide roller, or electrode plates are provided on both sides of the diaphragm between the second guide roller and the third guide roller.

[0015] Furthermore, the detection device further comprises an electrical signal detector, which is electrically connected to the electrode plates on both sides of the diaphragm to monitor the pressure difference change between the electrode plates on both sides of the diaphragm.

[0016] Furthermore, the detection device also includes two tension regulators, each tension regulator is connected to an electrode plate, and the two tension regulators adjust the tightness of the two electrode plates clamping the diaphragm.

[0017] Furthermore, the detection device also includes a shell, the power device and the detection device are arranged in the shell, the top of the shell is provided with an observation window 1, and the side of the shell is provided with an observation window 2.

[0018] Beneficial effects of the utility model:

[0019] The utility model guides the diaphragm to move at a uniform speed, sets electrode plates on both sides of the diaphragm, detects the change in the pressure difference between the electrode plates when the diaphragm passes, and finds possible defects of the diaphragm, such as holes, cracks, and coating leaks. The diaphragm will not be damaged during the test, thereby realizing a non-destructive detection of diaphragm weak points. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a structural schematic diagram of a non-destructive diaphragm weak point detection device according to a first embodiment of the present utility model;

[0021] Figure 2 This is a schematic structural diagram of the detection device of the utility model;

[0022] Figure 3 This is a schematic structural diagram of the housing of the utility model;

[0023] Figure 4This is a structural diagram of a non-destructive diaphragm weak point detection device according to a second embodiment of the present invention.

[0024] A. diaphragm;

[0025] 100, detection device; 110, electrode plate; 120, electrical signal detector; 130, tension adjuster;

[0026] 200, power device; 210, unwinding roller; 220, winding roller; 230, guide roller group; 231, first guide roller; 232, second guide roller; 233, third guide roller;

[0027] 300. Housing; 310. Observation window 1; 320. Observation window 2; 330. Door panel. DETAILED DESCRIPTION

[0028] The following describes in detail embodiments of the present invention. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar symbols throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention, and should not be construed as limiting the present invention.

[0029] Example 1, as Figure 1 As shown, the utility model discloses a non-destructive diaphragm weak point detection device, which includes a power device 200 and a detection device 100.

[0030] The detection device 100 includes electrode plates 110 disposed on both sides of the diaphragm A, an electrical signal detector 120 , and a tension adjuster 130 outside the two electrode plates 110 .

[0031] The power device 200 includes a unwinding roller 210 and a winding roller 220, wherein the diaphragm A, after being loaded, revolves around the roller surfaces of the unwinding roller 210 and the winding roller 220 at a uniform speed. The unwinding roller 210 and the winding roller 220 rotate in coordination, driving the diaphragm A to move at a uniform speed. Electrode plates 110 are arranged on both sides of the diaphragm A between the unwinding roller 210 and the winding roller 220.

[0032] The output and input ends of the electrical signal detector 120 are electrically connected to the electrode plates 110 on both sides of the diaphragm A. The side of the electrode plate 110 away from the diaphragm A is connected to a tightness adjuster 130 for adjusting the tightness of the diaphragm A.

[0033] During the test, a parallel circuit needs to be established first, and the diaphragm A is clamped with the electrode plate 110. At this time, the diaphragm A acts as a resistor in the parallel circuit, and the electrode plate 110 clamping device acts as a capacitor. The voltage is established and detected at both ends of the parallel circuit through the electrical signal detector 120.

[0034] Driven by the unwinding roller 210 and the winding roller 220 , the diaphragm A moves at a constant speed and passes through the upper and lower electrode plates 110 at a constant speed.

[0035] like Figure 2 As shown, the detection signal obtained by the control system setting of the electrical signal detector 120, for example, establishes a 100V voltage on the electrode plates 110 on both sides of the diaphragm A, measures the voltage difference drop value within 200ms, compares the drop value with the limit value, and records the output data through the electrical signal detector 120. For example, the limit value is 5V. When the pressure difference drops by more than 5V, it is considered that the diaphragm A is abnormal, and the electrical signal detector 120 alarms to indicate that the section of diaphragm A is abnormal, and subsequent processing is performed.

[0036] Furthermore, the power device 200 and the detection device 100 are arranged in the housing 300, as shown in FIG. Figure 3 As shown, the shell 300 is provided with a door panel 330 to facilitate the repair and maintenance of the device. An observation window 1 310 is provided on the top of the shell 300, and an observation window 2 320 is provided on the side of the shell 300 parallel to the diaphragm A. The shell 300 can protect the device, and the movement of the diaphragm A can be checked through the observation window.

[0037] Example 2, as Figure 4 As shown, based on the first embodiment, the power device 200 further includes a guide roller group 230, and the guide roller group 230 includes a first guide roller 231, a second guide roller 232 and a third guide roller 233;

[0038] The first guide roller 231 is close to the unwinding roller 210 , the third guide roller 233 is close to the winding roller 220 , and the second guide roller 232 is staggered between the first guide roller 231 and the third guide roller 233 .

[0039] After being loaded, the diaphragm A moves at a uniform speed around the roller surfaces of the unwinding roller 210 , the first guide roller 231 , the second guide roller 232 , the third guide roller 233 and the winding roller 220 .

[0040] The diaphragm A between the first guide roller 231 and the second guide roller 232 can be horizontal, and the diaphragm A between the second guide roller 232 and the third guide roller 233 can also be horizontal. Electrode plates 110 are arranged on both sides of the diaphragm A between the first guide roller 231 and the second guide roller 232, or electrode plates 110 are arranged on both sides of the diaphragm A between the second guide roller 232 and the third guide roller 233.

[0041] By providing the guide roller group 230 , the diaphragm A can be fully flattened, thereby achieving a smooth diaphragm A, which is beneficial for the detection of the diaphragm A.

[0042] Principle of the present invention: The present invention guides the diaphragm A to move at a uniform speed, sets electrode plates 110 on both sides of the diaphragm A, detects the change in pressure difference of the electrode plates 110 when the diaphragm A passes by, and finds possible defects of the diaphragm A, such as holes, cracks, coating leaks, etc. The diaphragm A will not be damaged during the test, thereby realizing a non-destructive detection of weak points of the diaphragm A.

[0043] The above is only a preferred specific implementation method of the present invention, but the protection scope of the present invention is not limited to this. Any technician familiar with the technical field within the technical scope disclosed by the present invention can make equivalent replacements or changes based on the technical solution and concept of the present invention, which should be covered by the protection scope of the present invention.

[0044] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

Claims

1. A non-destructive diaphragm weak point detection device, characterized in that: It comprises a power device (200) and a detection device (100); The detection device (100) includes electrode plates (110) arranged on both sides of the diaphragm (A), the power device (200) drives the diaphragm (A) through the electrode plates (110), and the detection device (100) detects weak points of the diaphragm (A) by using the pressure difference change of the electrode plates (110) on both sides of the diaphragm (A).

2. A non-destructive diaphragm weak point detection device according to claim 1, characterized in that: The power device (200) includes a reeling roller (210) and a reeling roller (220); After being loaded, the diaphragm (A) is wound around the roller surfaces of the unwinding roller (210) and the winding roller (220) at a uniform speed, and electrode plates (110) are provided on both sides of the diaphragm (A) between the unwinding roller (210) and the winding roller (220).

3. The non-destructive diaphragm weak point detection device according to claim 1, characterized in that: The power device (200) further comprises a guide roller group (230), wherein the guide roller group (230) comprises a first guide roller (231), a second guide roller (232) and a third guide roller (233); The first guide roller (231) is close to the unwinding roller (210), the third guide roller (233) is close to the winding roller (220), and the second guide roller (232) is staggered between the first guide roller (231) and the third guide roller (233); After being loaded, the diaphragm (A) is wound around the roller surfaces of the unwinding roller (210), the first guide roller (231), the second guide roller (232), the third guide roller (233) and the winding roller (220) at a uniform speed; Electrode plates (110) are provided on both sides of the diaphragm (A) between the first guide roller (231) and the second guide roller (232), or electrode plates (110) are provided on both sides of the diaphragm (A) between the second guide roller (232) and the third guide roller (233).

4. The non-destructive diaphragm weak point detection device according to claim 1, characterized in that: The detection device (100) further comprises an electrical signal detector (120), wherein the electrical signal detector (120) is electrically connected to the electrode plates (110) on both sides of the diaphragm (A) to monitor the pressure difference change between the electrode plates (110) on both sides of the diaphragm (A).

5. The non-destructive diaphragm weak point detection device according to claim 1, characterized in that: The detection device (100) further comprises two tightness adjusters (130), each tightness adjuster (130) is connected to an electrode plate (110), and the two tightness adjusters (130) adjust the tightness of the two electrode plates (110) clamping the diaphragm (A).

6. The non-destructive diaphragm weak point detection device according to claim 1, characterized in that: The detection device (100) further comprises a housing (300), wherein the power device (200) and the detection device (100) are arranged in the housing (300), an observation window 1 (310) is provided on the top of the housing (300), and an observation window 2 (320) is provided on the side of the housing (300).

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