A power battery foil magnetic metal foreign matter collection and detection device

Abstract

The utility model provides a power battery foil magnetic metal foreign matter collection and detection device, comprising a foreign matter collection component and a foreign matter detection device, wherein the foreign matter collection component comprises an upper magnetic bar, a lower magnetic bar and a conductive tape, wherein the upper magnetic bar and the lower magnetic bar are installed on a slitting machine for processing electromagnetic foil, and are respectively located above and below the electromagnetic foil, wherein the magnetic surfaces of the upper magnetic bar and the lower magnetic bar are arranged toward the electromagnetic foil, and when the slitting machine stops, the conductive tape is adhered to the magnetic surfaces of the upper magnetic bar and the lower magnetic bar to collect the metal foreign matter, and the foreign matter detection device is used for detecting and analyzing the metal foreign matter on the conductive tape, and the utility model can collect and quantitatively detect the metal foreign matter on the surface of the electromagnetic foil, effectively remove the metal foreign matter on the surface of the battery foil, and provide monitoring data for the production process of the battery foil.

Description

Technical Field

[0001] The utility model belongs to the technical field of battery foil processing, and particularly relates to a magnetic metal foreign matter collection and detection device for power battery foil. Background Art

[0002] Battery foil needs to go through two main processes, rolling and slitting, from blank to finished aluminum foil. Rolling needs to go through multiple passes. During the rolling process, the friction between the roller system and the aluminum foil, the friction between the roller system bearings, the circulating flushing of cooling lubricating oil used in the rolling process, and the impact of high-pressure gas used for degreasing, etc., may cause the generation of metal foreign matter and remain on the surface of the battery foil. In the slitting process, the driven roller operates under the friction provided by the tension of the aluminum foil. The active roller is driven by the motor and uses friction to drive the aluminum foil to operate. The disc knife is driven by the motor to operate and dynamically contact the battery foil for slitting. In each action, metal foreign matter may be generated and remain on the surface of the battery foil.

[0003] Battery foil is used as the positive electrode of lithium batteries and the positive and negative electrodes of sodium batteries as current collectors. Its function is to collect the active materials of the battery to form a larger current output, provide an electron channel for the electrochemical reaction, and accelerate the transfer of charge. In the battery formation stage, it will be oxidized at the positive electrode and then reduced at the negative electrode. When the metal element at the negative electrode accumulates to a certain extent, dendrites will form, causing perforation of the diaphragm, causing internal short circuit of the battery, and increasing the self-discharge rate of the battery. In severe cases, it may even cause the battery to catch fire or explode, affecting the safety performance of the battery. Abnormalities caused by slight obstruction between metals during the production process cannot be discovered in time, and batches of battery foils with a large amount of metal foreign matter may flow directly to the client, bringing safety risks to end consumers.

[0004] The growth process of battery foil is high-speed and continuous, and it is difficult to collect metal foreign matter during the production process of battery foil. Although the existing technology uses magnetic devices to remove metal foreign matter on battery foil, it does not collect and quantitatively detect the magnetic metal foreign matter on the upper and lower surfaces of the battery foil. It is impossible to analyze the composition and morphology of the metal foreign matter, and it is impossible to trace the production process backwards to provide monitoring data for the production process of the battery foil. In addition, the size of the metal foreign matter remaining on the surface of the battery foil is at the micron level, which cannot be viewed with the naked eye and is difficult to quantitatively detect. Utility Model Content

[0005] The utility model aims to provide a power battery foil magnetic metal foreign body collection and detection device, which can collect and quantitatively detect metal foreign bodies on the surface of electromagnetic foil, effectively remove metal foreign bodies on the surface of battery foil, and provide monitoring data for the production process of battery foil.

[0006] To achieve the above-mentioned purpose, the solution of the utility model is: a power battery foil magnetic metal foreign matter collection and detection device, comprising a foreign matter collection component and a foreign matter detection device, the foreign matter collection component comprising an upper magnetic bar, a lower magnetic bar and a conductive tape, the upper magnetic bar and the lower magnetic bar are installed on a slitting machine for processing electromagnetic foil, and are respectively located above and below the electromagnetic foil, the magnetic surfaces of the upper magnetic bar and the lower magnetic bar are arranged toward the electromagnetic foil, the conductive tape is adhered to the magnetic surfaces of the upper magnetic bar and the lower magnetic bar to collect metal foreign matter, and the foreign matter detection device is used to detect and analyze metal foreign matter on the conductive tape.

[0007] Furthermore, health tapes are pasted on the magnetic surfaces of the upper magnetic bar and the lower magnetic bar, and the conductive tapes are pasted on the health tapes to collect foreign matter.

[0008] Furthermore, the health tape is pasted with two layers on the magnetic surfaces of the upper magnetic rod and the lower magnetic rod. The outermost first layer of health tape on the magnetic surface is used to prevent the magnetic surface from being stained with metal foreign matter before the slitting machine is started, and the conductive tape is pasted on the second layer of health tape.

[0009] Furthermore, the health-preserving tape is pasted along the length direction of the upper magnetic rod and the lower magnetic rod, and the length of the health-preserving tape is greater than or equal to the width of the electromagnetic foil.

[0010] Furthermore, the conductive tape is repeatedly and continuously pasted on the upper magnetic bar and the lower magnetic bar for multiple times.

[0011] Furthermore, the slitting machine comprises a knife groove roller and a winder, and the upper magnetic rod and the lower magnetic rod are arranged between the knife groove roller and the winder.

[0012] Furthermore, there is a gap between the magnetic surfaces of the upper magnetic bar and the lower magnetic bar and the surface of the electromagnetic foil, and the gap is less than or equal to 10 mm.

[0013] Furthermore, the upper magnetic bar and the lower magnetic bar are permanent magnetic bars, and the magnetic field strength is 10000GS.

[0014] Furthermore, the foreign matter detection device is a scanning electron microscope or an optical microscope.

[0015] Furthermore, the conductive tape is a carbon tape having conductivity and adhesion.

[0016] After adopting the above scheme, the beneficial effects of the utility model are:

[0017] During the processing of electromagnetic foil, the utility model utilizes the upper magnetic rod and the lower magnetic rod to absorb the metal foreign matter on the upper surface and the lower surface of the electromagnetic foil, effectively removes the metal foreign matter on the upper and lower surfaces of the electromagnetic foil, and can also collect the metal foreign matter on the magnetic surfaces of the upper magnetic rod and the lower magnetic rod. After the slitting machine stops working, the metal foreign matter on the magnetic surface can be collected on the conductive tape by sticking the conductive tape on the magnetic surface, and then the conductive tape is torn off and then detected by a foreign matter detection device, so that the metal foreign matter on the conductive tape can be detected and analyzed, and the quantity, composition, form, etc. of the metal foreign matter can be analyzed specifically. According to the types and compositions of the collected metal foreign matter, the production process can be traced back, and monitoring data can be provided for the production process of the battery foil. In addition, the conductive tape can be stuck on part or all of the magnetic surfaces of the upper magnetic rod and the lower magnetic rod, and the distribution of the metal foreign matter in various areas of the surface of the electromagnetic foil can be analyzed, so as to realize quantitative detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the structure of the practical slitting machine;

[0019] Figure 2 This is a distribution diagram of the sticking of the practical conductive tape on the magnetic surface of the upper magnetic bar or the lower magnetic bar.

[0020] 1. Upper magnetic rod; 2. Lower magnetic rod; 3. Conductive tape; 4. Health tape; 5. Unwinder; 6. Roller system; 61. First floating roller; 62. Second floating roller; 63. First supporting roller; 64. Second supporting roller; 7. Slotted roller; 8. Flattening roller; 9. Winder. DETAILED DESCRIPTION

[0021] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0022] like Figure 1-2As shown, the utility model provides a power battery foil magnetic metal foreign body collection and detection device, comprising a foreign body collection component and a foreign body detection device, the foreign body collection component comprising an upper magnetic bar 1, a lower magnetic bar 2 and a conductive tape 3, the upper magnetic bar 1 and the lower magnetic bar 2 are installed on a slitting machine for processing electromagnetic foil, and are respectively located above and below the electromagnetic foil, the magnetic surfaces of the upper magnetic bar 1 and the lower magnetic bar 2 are arranged toward the electromagnetic foil, the upper magnetic bar 1 and the lower magnetic bar 2 are magnetic, and during the high-speed operation of the slitting machine, the metal foreign bodies can be adsorbed onto the magnetic surfaces, thereby effectively removing the metal foreign bodies on the upper and lower surfaces of the electromagnetic foil, preventing the electromagnetic foil with metal foreign bodies from flowing into the client, and improving the safety performance of the aluminum foil battery. When the slitting machine stops, the conductive tape 3 is pasted on the magnetic surface of the upper magnetic bar 1 and the lower magnetic bar 2 to collect the metal foreign matter on the magnetic surface on the conductive tape 3, and then the foreign matter detection device can be used to detect and analyze the metal foreign matter on the conductive tape 3. The foreign matter detection device uses an automatic counter with a counting function for micron-sized objects, which can be a scanning electron microscope, an optical microscope or other detection device that can identify micron-sized foreign matter, and can analyze the quantity, composition, morphology, etc. of the metal foreign matter. According to the type and composition of the collected metal foreign matter, the production process can be traced back to provide monitoring data for the production process of the battery foil. Moreover, the conductive tape 3 can be pasted on part or all of the magnetic surface of the upper magnetic bar 1 and the lower magnetic bar 2, and the magnetic surface can be divided into areas for quantitative detection to analyze the distribution of metal foreign matter in each area of ​​the electromagnetic foil surface.

[0023] Key References Figure 2 The utility model has health tape 4 pasted on the magnetic surfaces of the upper magnetic bar 1 and the lower magnetic bar 2. Metal foreign matter will be adsorbed on the health tape 4. The conductive tape 3 is pasted on the health tape 4 to collect the foreign matter. The health tape 4 is used to clean the magnetic surface. After the metal foreign matter is collected, the health tape 4 can be torn off to make the magnetic surfaces of the upper magnetic bar 1 and the lower magnetic bar 2 clean. There is no need to clean the magnetic surface again, and the use of the health tape 4 will not leave tape marks on the magnetic surface.

[0024] Furthermore, the health tape 4 is preferably pasted in two layers on the magnetic surfaces of the upper magnetic rod 1 and the lower magnetic rod 2. The outermost layer of the health tape 4 on the magnetic surface is used to prevent the magnetic surface from being stained with metal foreign matter before the slitting machine is started. Specifically, before the slitting machine is started, there will be metal foreign matter remaining on the surface of the electromagnetic foil. After pasting two layers of health tape 4, the metal foreign matter will remain on the first layer of health tape 4. The first layer of tape is torn off before the slitting machine is started, so that the second layer of tape can be kept clean. After the slitting machine stops, the conductive tape 3 is pasted on the second layer of health tape 4 to collect foreign matter. The first layer of health tape 4 can prevent the metal foreign matter from remaining before the electromagnetic foil is processed and affecting the detection results. The second layer of health tape 4 is used to clean the magnetic surface.

[0025] Key References Figure 2The health tape 4 is pasted along the length direction of the upper magnetic bar 1 and the lower magnetic bar 2. The length of the health tape 4 is greater than or equal to the width of the electromagnetic foil to ensure that all metal foreign matter on the surface of the electromagnetic foil can be adsorbed on the health tape 4. After the health tape 4 is pasted, it is necessary to confirm whether there are wrinkles at the end of the health tape 4 to avoid affecting the collection of metal foreign matter.

[0026] As a preferred embodiment, the conductive tape 3 is preferably a carbon tape with conductivity and adhesion, which can effectively collect metal foreign matter, and the conductive tape 3 can be repeatedly and continuously pasted on the upper magnetic rod 1 and the lower magnetic rod 2 for multiple times, specifically, the second layer of health tape 4 is repeatedly and continuously pasted for multiple times, for example, repeatedly and continuously pasted for multiple times along the length direction of the upper magnetic rod 1 or the lower magnetic rod 2, and there is no gap between the position of the latter pasting and the previous pasting, specifically as Figure 2 As shown; therefore, a conductive tape 3 can collect metal foreign matter in an area several times larger than the area of ​​the conductive tape 3, reduce the number of conductive tapes 3 used, reduce detection costs, and prevent waste; a conductive tape 3 can be repeatedly pasted 10 times. After testing, the metal foreign matter on the magnetic surface after the conductive tape 3 is pasted is very small and can be ignored.

[0027] As a preferred solution, a distance is left between the magnetic surfaces of the upper magnetic bar 1 and the lower magnetic bar 2 and the surface of the electromagnetic foil so as not to contact the magnetic surface to avoid affecting the processing of the aluminum foil. Moreover, the distance is preferably less than or equal to 10 mm. When the upper magnetic bar 1 and the lower magnetic bar 2 are within 10 mm of the electromagnetic foil, the magnetic field strength can reach 10000 GS, and the effect of adsorbing metal foreign matter is best. In addition, the upper magnetic bar 1 and the lower magnetic bar 2 are preferably permanent magnetic bars with a long service life.

[0028] Key References Figure 1The slitting machine includes an unwinder 5, a roller system 6, a knife groove roller 7, a flattening roller 8, and multiple winders 9. The roller system 6 includes multiple tensioning rollers and guide rollers. After the electromagnetic foil roll is unwinded by the unwinder 5, it is driven by the winder 9 to be rolled up. After being tensioned and guided by the tensioning roller and the guide roller, it moves to the knife groove roller 7 to be cut into multiple parts, and then is flattened by the flattening roller 8 and rolled up by the winder 9. In this process, the electromagnetic foil produces the most metal foreign matter when the knife groove roller 7 is cut. Therefore, it is preferred to set the upper magnetic bar 1 and the lower magnetic bar 2 between the knife groove roller 7 and the winder 9 to absorb the metal foreign matter after the electromagnetic foil is cut, so as to ensure that no metal foreign matter remains on the surface of the electromagnetic foil after cutting. Furthermore, there is enough space between the flattening roller 8 and the knife groove roller 7, and it is easier and more convenient to install the upper magnetic bar 1 and the lower magnetic bar 2 between the flattening roller 8 and the knife groove roller 7. In addition, the slitting tension parameter control range of the slitting machine is: transmission driving force -30~30N / mm2, shear driving force -100~0N / mm2, winding tension 10~60N / mm2. The overall slitting tension is controlled within the optimal range to reduce the generation of metal foreign matter and prevent the number of metal foreign matter from fluctuating too much and causing deviations in the detection results.

[0029] In addition to the tensioning roller and the guide roller, the roller system 6 is also provided with a first floating roller 61, a second floating roller 62, a first support roller 63 and a second support roller 64. There are two winders 9, the first floating roller 61 and the second floating roller 62 are respectively arranged above the two winders 9, and the first support roller 63 and the second support roller 64 are respectively arranged below the two winders 9. The roller pressure of the first floating roller 61 should be controlled between 1000 and 1800 N / m, the roller pressure of the second floating roller 62 should be controlled between 500 and 1200 N / m, the roller pressure of the first support roller 63 should be controlled between 500 and 1200 N / m, and the roller pressure of the second support roller 64 should be controlled between 1000 and 1800 N / m. If the roller pressure parameters are controlled beyond the above range, a large number of burrs will be generated on the cutting edge of the electromagnetic foil, affecting the cutting quality of the electromagnetic foil, and increasing the number of metal foreign matter, affecting the detection result of the metal foreign matter.

[0030] The above description is only a preferred embodiment of the present utility model and is not a limitation on the design of the present case. Any equivalent changes made based on the key design of the present case shall fall within the protection scope of the present case.

Claims

1. A power battery foil magnetic metal foreign body collection and detection device, characterized in that: It includes a foreign matter collection component and a foreign matter detection device. The foreign matter collection component includes an upper magnetic bar, a lower magnetic bar and a conductive tape. The upper magnetic bar and the lower magnetic bar are installed on a slitting machine for processing electromagnetic foil and are respectively located above and below the electromagnetic foil. The magnetic surfaces of the upper magnetic bar and the lower magnetic bar are arranged toward the electromagnetic foil. The conductive tape is attached to the magnetic surfaces of the upper magnetic bar and the lower magnetic bar to collect metal foreign matter. The foreign matter detection device is used to detect and analyze the metal foreign matter on the conductive tape.

2. A power battery foil magnetic metal foreign matter collection and detection device as claimed in claim 1, characterized in that: Health tapes are pasted on the magnetic surfaces of the upper magnetic bar and the lower magnetic bar, and the conductive tapes are pasted on the health tapes to collect foreign matter.

3. A power battery foil magnetic metal foreign matter collection and detection device as claimed in claim 2, characterized in that: The health tape is pasted with two layers on the magnetic surfaces of the upper magnetic rod and the lower magnetic rod. The outermost first layer of health tape on the magnetic surface is used to prevent the magnetic surface from being stained with metal foreign matter before the slitting machine is turned on, and the conductive tape is pasted on the second layer of health tape.

4. A power battery foil magnetic metal foreign matter collection and detection device as claimed in claim 2 or 3, characterized in that: The health-preserving tape is pasted along the length direction of the upper magnetic rod and the lower magnetic rod, and the length of the health-preserving tape is greater than or equal to the width of the electromagnetic foil.

5. A power battery foil magnetic metal foreign matter collection and detection device as claimed in any one of claims 1 to 3, characterized in that: The conductive tape is repeatedly and continuously pasted on the upper magnetic rod and the lower magnetic rod for multiple times.

6. A power battery foil magnetic metal foreign matter collection and detection device as claimed in claim 1, characterized in that: The slitting machine comprises a knife groove roller and a winding machine, and the upper magnetic rod and the lower magnetic rod are arranged between the knife groove roller and the winding machine.

7. A power battery foil magnetic metal foreign matter collection and detection device as claimed in claim 1, characterized in that: There is a gap between the magnetic surfaces of the upper magnetic bar and the lower magnetic bar and the surface of the electromagnetic foil, and the gap is less than or equal to 10 mm.

8. A power battery foil magnetic metal foreign matter collection and detection device as claimed in claim 7, characterized in that: The upper magnetic bar and the lower magnetic bar are permanent magnetic bars, and the magnetic field strength is 10000GS.

9. A power battery foil magnetic metal foreign matter collection and detection device as claimed in claim 1, characterized in that: The foreign matter detection device is a scanning electron microscope or an optical microscope.

10. A power battery foil magnetic metal foreign matter collection and detection device as claimed in claim 1, characterized in that: The conductive tape is a carbon tape with conductivity and adhesion.

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