Tool for detecting damage condition of insulating gummed paper

Abstract

The utility model provides a tool for detecting the damage condition of insulating gummed paper, which comprises a reaction component and a dropper used for dropwise adding a liquid solution to the reaction component, the reaction component comprises a fixed plate and PH test paper which are sequentially overlapped and attached from top to bottom, the fixed plate is provided with a through hole, and the PH test paper is arranged in the through hole. The aperture of the through hole is limited by the fact that liquid drops of the liquid solution can penetrate through the through hole when the dropper is used for dropwise adding the liquid solution; the PH test paper is positioned in the vertical projection range of the through hole. According to the utility model, after the liquid solution is dropped into the through hole of the fixed plate, whether the PH test paper positioned below the insulated gummed paper to be detected generates color change reaction is observed, so that whether the insulated gummed paper to be detected is damaged can be simply, quickly and effectively judged; and the quality safety problems of battery short circuit, heating and the like caused by battery manufacturing when the insulated gummed paper to be detected is damaged are avoided.

Description

Technical Field

[0001] The utility model relates to the field of batteries, in particular to a method and a tool for detecting damage of insulating adhesive tape. Background Art

[0002] When making batteries, insulating tape is usually used to isolate the positive and negative sides. For example, for button batteries with wound cells, the wound cells are made by winding a three-layer structure consisting of a positive electrode sheet, a separator, and a negative electrode sheet stacked in sequence, and the wound cells are coaxially loaded into the battery pole shell. In order to avoid contact short circuits between the negative electrode sheet end of the wound cell at the positive electrode shell end and the positive electrode shell, or between the positive electrode sheet end of the wound cell at the negative electrode shell end and the negative electrode shell, insulating tape needs to be affixed to both end surfaces of the wound cell. When the insulating tape is damaged due to burrs and extrusion of processing equipment, the positive and negative electrodes of the battery cell will have a risk of increased voltage drop or even contact short circuit due to the decrease in the insulation performance of the tape. The damage of the insulating tape, especially some minor damage, cannot be effectively judged by the naked eye or even under a magnifying glass. Therefore, there is currently no effective method or tool for detecting the damage of the insulating tape. Utility Model Content

[0003] The utility model aims to provide a tool for detecting the damage of insulating adhesive tape, by which the damage of insulating adhesive tape used in the battery manufacturing process can be effectively evaluated and judged.

[0004] A tool for detecting the damage of insulating adhesive tape, comprising a reaction component and a dropper for dripping a liquid solution onto the reaction component, wherein the reaction component comprises a fixed plate and a pH test paper stacked and attached in sequence from top to bottom, wherein a through hole is provided on the fixed plate, wherein the aperture of the through hole is limited to a limit that a drop of the liquid solution can pass through the through hole when the dropper is used to drip the liquid solution; and the pH test paper is located within the vertical projection range of the through hole.

[0005] When using the tool to detect damage to the insulating tape, the insulating tape to be detected is attached to the bottom surface of the fixed plate, the outer edge of the insulating tape to be detected is located on the outside of the through hole, and the suspected damaged part of the insulating tape is located within the vertical projection range of the through hole; the PH test paper is then set in close contact with the bottom surface of the insulating tape to be detected, and the PH test paper is located directly below the suspected damaged part of the insulating tape.

[0006] The utility model can simply, quickly and effectively judge whether the insulating tape to be tested is damaged by dropping a liquid solution into the through hole of the fixed plate and observing whether the pH test paper under the insulating tape to be tested produces a color change reaction, thereby avoiding quality and safety problems such as battery short circuit and heating caused by manufacturing a battery when the insulating tape to be tested is damaged.

[0007] The through hole is preferably controlled at 4 to 10 mm. Since the tool for detecting the damage of insulating adhesive tape of the utility model is used for damage detection of insulating adhesive tape with slight defects, the suspected damaged area of ​​the insulating adhesive tape is very small. When the through hole is too large (greater than 10 mm), the difficulty of aligning the suspected damaged area of ​​the insulating adhesive tape increases. When the through hole is too small (less than 4 mm), the liquid droplets are not easy to flow downward under the action of surface tension when using a common rubber-tipped dropper on the market to drip liquid, and a small-dose syringe needs to be replaced, which will increase the equipment cost and operation difficulty.

[0008] A sealing tape may also be provided below the PH test paper, the outer edge of the sealing tape being located outside the PH test paper, the adhesive surface of the sealing tape facing upward and being able to be bonded to the bottom surface of the fixed plate. By bonding the sealing tape to the bottom surface of the fixed plate, the gap between the outer edge of the insulating tape to be tested and the fixed plate can be sealed, so as to prevent the liquid solution from penetrating downward from the gap between the insulating tape to be tested and the fixed plate when excessive dripping is performed, thereby interfering with the test result.

[0009] Furthermore, the fixing plate is preferably a plate resistant to acid and alkali corrosion, such as an acrylic plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a schematic diagram of the assembly and use state of the tool for detecting the damage of insulating adhesive tape of the utility model;

[0011] Figure 2 It is a schematic diagram of the axial cross-sectional structure of the reaction assembly of the utility model;

[0012] Figure 3 The utility model is a schematic diagram of the top view of the structure of the tool for detecting the damage of insulating adhesive tape. DETAILED DESCRIPTION

[0013] The following is a detailed description of the specific implementation of the method and tool for detecting the damage of insulating tape of the utility model in conjunction with the accompanying drawings:

[0014] Combination Figure 1 to Figure 3A tool for detecting the damage of insulating adhesive tape, comprising a reaction component 100 and a dropper 300 for dripping a liquid solution 200 onto the reaction component 100, wherein the reaction component 100 comprises a fixed plate 10, a PH test paper 20 and a sealing adhesive tape 30 which are stacked and attached in sequence from top to bottom, wherein a through hole 11 is provided on the fixed plate 10, and the aperture of the through hole 11 is limited to the limit that the droplets of the liquid solution 200 can pass through the through hole 11 when the dropper 300 is used to drip the liquid solution 200; the PH test paper 20 is located within the vertical projection range of the through hole 11, the outer edge of the sealing adhesive tape 30 is located outside the PH test paper 20, and the adhesive surface of the sealing adhesive tape 30 faces upward and can be bonded to the bottom surface of the fixed plate 10.

[0015] Combination Figure 1 to Figure 3 When using the tool to detect the damage of the insulating tape 400, firstly, the insulating tape 400 to be detected is attached to the bottom surface of the fixed plate 10, the outer edge of the insulating tape 400 to be detected is located on the outside of the through hole 11, and the suspected damaged part A of the insulating tape 400 is located within the vertical projection range of the through hole 11; then, the PH test paper 20 is set in close contact with the bottom surface of the insulating tape 400 to be detected, and the PH test paper 20 is located directly below the suspected damaged part A of the insulating tape 400; the outer edge of the sealing tape 30 is located on the outside of the insulating tape 400 to be detected. After dripping the liquid solution 200 into the through hole 11 of the fixing plate 10, let it stand for a while, then peel off the sealing tape 30, and observe whether the PH test paper 20 changes color. When the PH test paper 20 changes color corresponding to the liquid solution 200, the suspected damaged part A of the insulating tape 400 to be detected is damaged; when the PH test paper 20 does not change color, the suspected damaged part A of the insulating tape to be detected is not damaged.

[0016] When manufacturing a battery, the insulating tape 400 that has been tested and is not damaged can be directly used or the insulating tape 400 can be cut and used according to the size requirements of the battery for the insulating tape 400.

[0017] Of course, the tool for detecting the damage of the insulating tape 400 may not be provided with the sealing tape 50. In this case, the amount of the liquid solution dripped is sufficient to completely soak the damaged part A of the insulating tape 400 to be detected, and excessive dripping is avoided. When the sealing tape 30 is provided, the gap between the outer edge of the insulating tape 30 to be detected and the fixing plate 10 can be sealed by bonding the sealing tape 30 to the bottom surface of the fixing plate 10, so that the liquid solution 200 can be prevented from penetrating downward from the gap between the insulating tape 30 to be detected and the fixing plate 10 when excessive dripping is added, thereby interfering with the detection result.

[0018] The through hole 11 is preferably controlled to be 4 to 10 mm. Since the tool for detecting the damage of the insulating adhesive tape of the utility model is for damage detection of the insulating adhesive tape 400 with slight defects, the suspected damaged area of ​​the insulating adhesive tape 400 is very small. When the through hole 11 is too large (greater than 10 mm), the difficulty of aligning the suspected damaged area of ​​the insulating adhesive tape 400 increases. When the through hole 11 is too small (less than 4 mm), when using a common rubber-tipped dropper on the market to drip liquid, the droplets are not easy to flow downward under the action of surface tension, and a small-dose syringe needs to be replaced, which will increase the equipment cost and operation difficulty.

[0019] The liquid solution 200 may be an alkaline solution, such as a NaOH solution or a KOH solution. Since the electrolyte of a lithium battery is usually alkaline, the liquid solution 200 has a higher matching degree with the electrolyte of a lithium battery when it is an alkaline solution. Of course, the liquid solution 200 is not limited to an alkaline solution, and it may be an acidic solution or a neutral solution, as long as it is a solution that can cause the pH test paper 20 to change color when dripped onto the pH test paper 20.

[0020] Furthermore, the fixing plate 10 may be, but is not limited to, an acrylic plate, which is preferably a plate resistant to acid and alkali corrosion.

[0021] It should be noted that the shapes of the fixing plate 10, the insulating tape 400 to be tested, the PH test paper 20 and the sealing tape 30 of the present invention are not limited to the specific shapes shown in the drawings.

[0022] For ordinary technicians in the technical field to which the utility model belongs, the utility model can make several simple deductions or substitutions without departing from the concept of the utility model, which should be regarded as falling within the protection scope of the utility model.

Claims

1. A tool for detecting the damage of insulating tape, characterized in that: The invention comprises a reaction component and a dropper for dripping a liquid solution onto the reaction component. The reaction component comprises a fixed plate and a pH test paper which are stacked and attached in sequence from top to bottom. A through hole is provided on the fixed plate. The aperture of the through hole is limited to the size that a drop of the liquid solution can pass through when the dropper is used to drip the liquid solution. The pH test paper is located within the vertical projection range of the through hole.

2. The tool for detecting damage of insulating tape according to claim 1, characterized in that: When detecting damage to the insulating tape, the insulating tape to be detected is attached to the bottom surface of the fixed plate, the outer edge of the insulating tape to be detected is located on the outside of the through hole, and the suspected damaged part of the insulating tape is located within the vertical projection range of the through hole; the PH test paper is then set in close contact with the bottom surface of the insulating tape to be detected, and the PH test paper is located directly below the suspected damaged part of the insulating tape.

3. The tool for detecting damage of insulating tape according to claim 1, characterized in that: The through hole is controlled to be 4 to 10 mm.

4. The tool for detecting damage of insulating tape according to claim 1, characterized in that: A sealing tape is also arranged below the PH test paper, the outer edge of the sealing tape is located outside the PH test paper, the adhesive surface of the sealing tape faces upward and can be bonded to the bottom surface of the fixing plate.

5. The tool for detecting damage of insulating tape according to claim 1, characterized in that: The fixing plate is preferably a plate resistant to acid and alkali corrosion.

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