Method for removing battery insulating film

Abstract

The invention relates to the technical field of insulating film removal, in particular to a method for removing a battery insulating film. The removing method comprises the steps that S100, laser cutting is conducted, specifically, a first notch and a second notch which intersect with each other are formed in a first part of an insulating film through laser, the first part is the part, covering the first surface of a battery, of the insulating film, and the first surface is the surface with the largest area of the battery; s200, manual film removal: tearing a notch end, formed at a first intersection of the first notch and the second notch, of the insulating film in a direction far away from the first intersection; and light spots of the laser used for forming the first notch and the second notch are rectangular. Therefore, the insulating film is not removed in a burning mode, so that the problem of environmental pollution caused by burning of the insulating film can be solved.

Description

Technical Field

[0001] This application relates to the technical field of insulating film removal, and particularly to a method for removing a battery insulating film. Background Art

[0002] In order to prevent the battery cells from spreading, blue film is used as an insulating material between the batteries during the battery manufacturing process, which can play a good protective role and prevent the influence of individual battery cells on other battery cells due to various faults.

[0003] Due to the yield problem of subsequent processes, if the battery cells of an aluminum shell battery need to be disassembled and re-encapsulated, the blue film wrapped outside the aluminum shell battery needs to be removed first. In related technologies, the blue film is removed by burning. However, the blue film is usually made of various chemical materials, and these materials will release harmful gases during the combustion process, polluting the environment. Summary of the Invention

[0004] The embodiments of this application disclose a method for removing a battery insulating film, which can solve the environmental pollution problem caused when removing the blue film.

[0005] To achieve the above object, the embodiments of this application disclose a method for removing a battery insulating film, including:

[0006] S100. Laser cutting: Intersecting first and second cuts are made through a laser in a first part of the insulating film. The first part is the part of the insulating film covering the first surface of the battery, and the first surface is the surface with the largest area of the battery;

[0007] S200. Manual film removal: The cut end formed at the first intersection of the first and second cuts of the insulating film is torn in a direction away from the first intersection.

[0008] The shape of the light spot of the laser used to make the first and second cuts is rectangular.

[0009] Optionally, the first part is rectangular, the first intersection is close to a first corner of the outer surface of the first part, and the first corner is any corner of the outer surface of the first part.

[0010] Optionally, the outer surface of the first part includes adjacent first and second edges, the first corner is the corner close to the second intersection of the first and second edges, and step S100 includes:

[0011] S110. Through the laser, a first cut is made on the first part along a direction parallel to the first edge, and a second cut intersecting the first cut is made on the first part along a direction parallel to the second edge.

[0012] Optionally, the outer surface of the first part further includes a third edge and a fourth edge which are adjacently arranged, the third edge is parallel to the first edge, and the fourth edge is parallel to the second edge;

[0013] The maximum distance between the first cut and the fourth edge is less than 10 mm, and the maximum distance between the second cut and the third edge is less than 10 mm.

[0014] Optionally, the distance between the first cut and the first edge is 10 - 20 mm, and the distance between the second cut and the second edge is 10 - 20 mm.

[0015] Optionally, the battery is a square battery, and the square battery further includes a second surface and a third surface. The third surface is arranged opposite to the first surface, and the second surface is adjacently arranged with the first surface and the third surface respectively;

[0016] The insulating film further includes a second part, a first folded edge part and a second folded edge part. The second part covers the third surface. The first folded edge part is bent relative to the first part, and the second folded edge part is bent relative to the second part. The first folded edge part is pasted on the second surface, and at least part of the second folded edge part overlaps on the outer surface of the first folded edge part;

[0017] The cut end and the first folded edge part are located on the same side of the first cut.

[0018] Optionally, the two ends of the first cut are respectively located on both sides of the second cut, and the two ends of the second cut are respectively located on both sides of the first cut.

[0019] Optionally, the power of the laser used for making the first cut and the second cut is 100 - 300 W.

[0020] Optionally, before step S100, or after step S100 and before step S200, it further includes:

[0021] S300. Laser cleaning: Using a laser to clean the insulating film to reduce the bonding strength of the adhesive layer between the insulating film and the battery.

[0022] Optionally, the power of the laser used for cleaning is 500 - 2000 W.

[0023] Compared with the related art, the beneficial effects of this application are:

[0024] In this application, intersecting first and second cuts are made on the first part of the insulating film of the battery by a laser. This can disconnect the cut end formed at the intersection of the first cut and the second cut from the other parts of the insulating film, and the insulating film can be torn off from the battery by pulling the cut end. It can be seen that this application does not use the way of burning to remove the insulating film, thus solving the problem of environmental pollution caused by burning the insulating film.

[0025] And when pulling and tearing the cut end, the other parts of the insulating film will not restrict the pulling of the cut end. Thus, a relatively small pulling force can be used to tear the cut end from the battery, making it not easy to be broken; and when tearing to the end of the first cut or the second cut, a certain length of the insulating film has been torn off. At this time, even if a relatively large pulling force is applied to the insulating film, the pulling force can be dispersed along the relatively long insulating film, making the stress distribution more uniform, reducing the situation of excessive local stress, and thus reducing the risk of the insulating film breaking. It can be seen that adopting the method of this application can prevent the insulating film from breaking during the process of tearing the insulating film. Thus, there is no need to reselect the starting point of tearing, thereby improving the tearing efficiency of the insulating film. Description of the Drawings

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required to be used in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0027] Figure 1 It is a schematic flow chart of the removal method disclosed in the embodiment of the present application;

[0028] Figure 2 It is a schematic flow chart of the removal method disclosed in another embodiment of the present application;

[0029] Figure 3 It is a schematic flow chart of the removal method disclosed in yet another embodiment of the present application;

[0030] Figure 4 It is a schematic diagram of making the first cut and the second cut on the insulating film in the embodiment of the present application;

[0031] Figure 5 It is a schematic diagram of the laser spot disclosed in the prior art and the laser spot disclosed in the embodiment of the present application;

[0032] Figure 6 It is a schematic diagram of the wrapping process of the insulating film.

[0033] Description of the Reference Numerals:

[0034] 100, insulating film; 101, cut end; 110, first part; 111, first corner; 112, first edge; 113, second edge; 114, third edge; 115, fourth edge; 120, first folded edge part; 130, second folded edge part; 140, third folded edge part; 150, second part; 210, first cut; 220, second cut; 300, spot. Detailed Embodiments

[0035] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0036] In the present invention, the orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "vertical", "horizontal", "lateral", "longitudinal", etc. is based on the orientation or positional relationship shown in the accompanying drawings. These terms are mainly used to better describe the present invention and its embodiments, and are not used to limit that the indicated devices, elements or components must have a specific orientation or be constructed and operated in a specific orientation.

[0037] Moreover, in addition to being used to represent the orientation or positional relationship, some of the above terms may also be used to represent other meanings. For example, the term "upper" may also be used to represent a certain attachment relationship or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in the present invention can be understood according to specific circumstances.

[0038] In addition, the terms "mounted", "arranged", "provided with", "connected", "linked" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral structure; it may be a mechanical connection or an electrical connection; it may be directly connected, or indirectly connected through an intermediate medium, or there may be internal communication between two devices, elements or components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0039] In addition, the terms "first", "second", etc. are mainly used to distinguish different devices, elements or components (the specific types and structures may be the same or different), and are not used to indicate or imply the relative importance and quantity of the indicated devices, elements or components. Unless otherwise specified, the meaning of "a plurality" is two or more.

[0040] In order to solve the environmental pollution problem caused by burning the insulating film, the inventor provides another method for removing the battery insulating film, which can not only solve the environmental pollution problem caused by burning the blue film, but also reduce the risk of tearing the insulating film, so as to improve the tearing efficiency of the insulating film.

[0041] The method for removing the battery insulating film provided in the embodiments of the present application will be described in detail below with reference to the accompanying drawings through specific embodiments and their application scenarios.

[0042] As Figure 1 shown, an embodiment of the present application discloses a method for removing a battery insulating film, including:

[0043] S100. Laser cutting: Intersecting first cut 210 and second cut 220 are formed by laser in the first portion 110 of the insulating film 100. The first portion 110 is the portion of the insulating film 100 covering the first surface of the battery, and the first surface is the surface with the largest area of the battery. Specifically, the first cut 210 and the second cut 220 are formed on the largest surface of the insulating film. In this way, not only can the first cut 210 and the second cut 220 extend a longer length, but also the area and length of the portion of the first portion 110 that can be torn up are larger. In this way, the portion of the first portion 110 that can be torn up can share more stress, so as to strengthen the effect of preventing the insulating film 100 from breaking. It should be noted that the laser used for laser cutting can be pulsed light.

[0044] Exemplarily, the first cut 210 and the second cut 220 here both penetrate the first portion 110 of the insulating film 100, that is, both the first cut 210 and the second cut 220 penetrate from the outer surface of the insulating film 100 to the inner surface of the insulating film 100; the first cut 210 can be a continuous cut, such as a straight line shape, a curve shape, etc., or a discontinuous cut, such as a dotted line shape. The present application does not limit the shape of the first cut 210; similarly, the second cut 220 can also be a continuous or discontinuous cut, and the present application does not limit this.

[0045] Exemplarily, the insulating film 100 here can be a battery blue film, and the insulating film 100 can be made of polyolefin materials, such as polypropylene, polyethylene, polybutene and other materials; in the process of manufacturing the insulating film 100 using polyolefin materials, some additives can also be added, such as flame retardants, antioxidants, etc., to improve the performance of the insulating film 100.

[0046] It should be noted that the present application does not limit the order of forming the first cut 210 and the second cut 220. The first cut 210 can be formed first, or the second cut 220 can be formed first, or the first cut 210 and the second cut 220 can be formed simultaneously.

[0047] S200. Manual film removal: Tear the cut end 101 formed at the first intersection of the first cut 210 and the second cut 220 of the insulating film 100 in a direction away from the first intersection, so that the insulating film 100 can be torn off from the battery.

[0048] The shape of the light spot of the laser used for forming the first cut and the second cut is rectangular. Specifically, please refer to Figure 5For the upper half of the drawing, when the shape of the laser spot 300 is elliptical, the areas at both ends of the ellipse are relatively small. To achieve a good cutting effect, it is necessary to partially overlap two adjacent spots 300, and the overlapping length is relatively long. Therefore, for a preset cutting length, a relatively large number of dots need to be made with the elliptical spot 300. For example, Figure 5 fifteen times shown in the upper half of the drawing.

[0049] Please refer to Figure 5 For the lower half of the drawing, in this embodiment, a rectangular spot 300 is used. The areas at both ends of the rectangle are relatively large. Therefore, two adjacent spots 300 do not need to overlap or only need to overlap a very small length to achieve a good cutting effect. Therefore, for the same preset cutting length, the number of dots that need to be made with the rectangular spot 300 will be greatly reduced. Figure 5 Ten times shown in the lower half of the drawing. Obviously, using the rectangular spot 300 can reduce the number of dots and improve the cutting efficiency.

[0050] In this application, the laser is used to open intersecting first incisions 210 and second incisions 220 on the first part 110 of the insulating film 100 of the battery. This can disconnect the incision end 101 formed at the intersection of the first incision 210 and the second incision 220 from other parts of the insulating film 100. By pulling the incision end 101, the insulating film 100 can be torn off from the battery. It can be seen that this application does not use the method of burning to remove the insulating film 100, thus solving the problem of environmental pollution caused by burning the insulating film 100.

[0051] Moreover, when pulling and tearing the above-mentioned incision end 101, other parts of the insulating film 100 will not restrict the pulling of the incision end 101. In this way, a relatively small pulling force can be used to tear the incision end 101 from the battery, making it not easy for the incision end 101 to be broken; and when tearing to the end of the first incision 210 or the second incision 220, the insulating film 100 has been torn off a certain length. At this time, even if other parts of the insulating film 100 apply a constraint to the part of the insulating film 100 to be torn off, resulting in a relatively large pulling force being applied to the insulating film 100, the pulling force can be dispersed along the relatively long insulating film 100, making the stress distribution more uniform and reducing the situation of excessive local stress, thereby reducing the risk of the insulating film 100 breaking. It can be seen that using the method of this application can prevent the insulating film 100 from breaking during the process of tearing off the insulating film 100. In this way, there is no need to reselect the starting point for tearing, thereby improving the tearing efficiency of the insulating film 100.

[0052] In addition, when tearing to the end of the first incision 210 or the second incision 220, since the insulating film 100 has been torn off a certain length, the risk of the insulating film 100 breaking is reduced. Therefore, after tearing to the end of the first incision 210 or the second incision 220, the insulating film 100 can still be continuously torn off, so that all parts of the insulating film 100 can be torn off from the battery. It can be seen that after adopting the method of the present application, only the first incision 210 and the second incision 220 need to be opened in the first part 110 of the insulating film 100, and all parts of the insulating film 100 can be torn off at one time, without opening the first incision 210 and the second incision 220 in each part of the insulating film 100 and then tearing off each part of the insulating film 100 separately. Obviously, this can improve the tearing efficiency of the insulating film 100.

[0053] In an alternative embodiment, please refer to Figure 4 , the first part 110 is rectangular, and the first intersection is close to the first corner 111 of the outer surface of the first part 110. That is to say, the incision end 101 is arranged close to the first corner 111, and the first corner 111 is any corner of the outer surface of the first part 110.

[0054] In this embodiment, the first intersection is close to the first corner 111 of the outer surface of the first part 110. That is to say, the incision end 101 is arranged close to the first corner 111. The starting points of the first incision 210 and the second incision 220 are close to the first corner 111, and the ending points of the first incision 210 and the second incision 220 are far from the first corner 111. This can make the incision end 101 relatively far from the edges of the first part 110 that are not used to form the first corner 111 (such as the third edge 114 and the fourth edge 115 described below).

[0055] During the process of tearing off the insulating film 100, it is necessary to pull the incision end 101 to the edges of the first part 110 that are not used to form the first corner 111 to separate the first part 110 from the battery. Therefore, in this embodiment, the incision end 101 is relatively far from the edges of the first part 110 that are not used to form the first corner 111, which can make the area and length of the part of the first part 110 that is torn up larger. In this way, when tearing to other parts of the insulating film 100 that are connected to the first part 110 (such as the first folded edge part 120 described below), the part of the first part 110 that is torn up can share more stress, so as to prevent the part of the insulating film 100 that is torn up from breaking. In this way, there is no need to reselect the starting point of tearing, thus improving the tearing efficiency of the insulating film 100.

[0056] Of course, the intersection of the first incision 210 and the second incision 220 can also be located in the middle of the first part 110. The present application does not limit the position of the intersection of the first incision 210 and the second incision 220.

[0057] In an alternative embodiment, the outer surface of the first part 110 includes adjacent first and second edges 112 and 113, and the first corner 111 is the corner near the second intersection of the first edge 112 and the second edge 113. Step S100 includes:

[0058] S110: Make a first cut 210 on the first part 110 along a direction parallel to the first edge 112 by laser, and make a second cut 220 intersecting with the first cut 210 on the first part 110 along a direction parallel to the second edge 113.

[0059] By using the method of this embodiment, the first cut 210 can be parallel to the first edge 112, and the second cut 220 can be parallel to the second edge 113. That is to say, the cut end 101 is a right angle. In this way, not only can the first cut 210 and the second cut 220 extend a relatively large length, but also the area of the part of the first part 110 that can be torn up is relatively large, so as to strengthen the effect of preventing the insulating film 100 from being torn off in this embodiment. Of course, the cut end 101 can also be an acute angle or an obtuse angle, and the present application does not limit this.

[0060] In an alternative embodiment, please refer to Figure 4 , the outer surface of the first part 110 further includes adjacent third and fourth edges 114 and 115. The third edge 114 is parallel to the first edge 112, and the fourth edge 115 is parallel to the second edge 113. The maximum distance between the first cut 210 and the fourth edge 115 is less than ten millimeters, and the maximum distance between the second cut 220 and the third edge 114 is less than ten millimeters.

[0061] In this embodiment, the maximum distance between the first cut 210 and the fourth edge 115 is less than ten millimeters, and the maximum distance between the second cut 220 and the third edge 114 is less than ten millimeters. That is to say, the extension lengths of both the first cut 210 and the second cut 220 are relatively large. In this way, when tearing to the end of the first cut 210 or the second cut 220, a relatively large length of the insulating film 100 can be torn off, further strengthening the effect of preventing the insulating film 100 from breaking. Of course, the maximum distance between the first cut 210 and the fourth edge 115 can also be greater than ten millimeters, and the maximum distance between the second cut 220 and the third edge 114 can also be greater than ten millimeters.

[0062] In an alternative embodiment, the distance between the first cut 210 and the first edge 112 is 10 - 20 mm, and the distance between the second cut 220 and the second edge 113 is 10 - 20 mm.

[0063] If the distance between the first incision 210 and the first edge 112 is less than 10 mm, the first incision 210 is too close to the first edge 112, and the stress at the edge of the insulating film 100 is relatively concentrated, which easily causes the insulating film 100 to be torn during the removal of the insulating film 100; if the distance between the first incision 210 and the first edge 112 is greater than 20 mm, the first edge 112 is relatively close to the middle of the first part 110, which will result in a smaller area of the part of the first part 110 that is torn up, and the stress that the torn-up part of the first part 110 can share is smaller, which will weaken the effect of preventing the torn-up part of the insulating film 100 from breaking. It can be seen that in this embodiment, controlling the distance between the first incision 210 and the first edge 112 to be 10-20 mm can prevent the insulating film 100 from breaking during the removal of the insulating film 100. Similarly, controlling the distance between the second incision 220 and the second edge 113 to be 10-20 mm can also prevent the insulating film 100 from breaking during the removal of the insulating film 100.

[0064] In an alternative embodiment, the battery is a square battery, and the square battery further includes a second surface and a third surface. The third surface is disposed opposite to the first surface, and the second surface is adjacent to the first surface and the third surface respectively. It should be noted that the shape of the square battery is generally a cuboid. In this case, there are two surfaces with the largest area of the square battery, and the second surface is any one of these two surfaces; when the shape of the square battery is a square, the first surface is any surface of the square battery.

[0065] The insulating film 100 further includes a second part 150, a first folding edge part 120, and a second folding edge part 130. The second part 150 covers the third surface. The first folding edge part 120 is bent relative to the first part 110, and the second folding edge part 130 is bent relative to the second part 150. The first folding edge part 120 is pasted on the second surface, and at least part of the second folding edge part 130 is stacked on the outer surface of the first folding edge part 120. Here, the outer surface of the first folding edge part 120 is the surface of the first folding edge part 120 facing away from the battery.

[0066] Please refer to Figure 6 , the first folding edge part 120 of the insulating film 100 is bent relative to the first part 110 and thus directly pasted on the second surface. The insulating film 100 further has a second part 150 opposite to the first part 110. The second folding edge part 130 is bent relative to the second part 150 and thus stacked and connected to the outer surface of the first folding edge part 120; the insulating film 100 further has a third folding edge part 140 and a third part pasted on the bottom of the battery. The third part is opposite to the end cover of the battery. The third folding edge part 140 is bent relative to the third part, and the third folding edge part 140 is stacked on the outer surface of the first folding edge part 120 and the outer surface of the second folding edge part 130.

[0067] The cut end 101 and the first folded edge portion 120 are located on the same side of the first cut 210. That is to say, the cut end 101 and the first folded edge portion 120 are not separated by the first cut 210 or the second cut 220. Namely, one of the first cut 210 and the second cut 220 is located on the side of the cut end 101 facing away from the first folded edge portion 120. As Figure 4 shown, the first cut 210 is located on the side of the cut end 101 facing away from the first folded edge portion 120.

[0068] In this embodiment, the first folded edge portion 120 bent relative to the first part 110 is pressed inside the second folded edge portion 130, while the first cut 210 and the second cut 220 are formed in the first part 110, and the cut end 101 formed at the intersection of the first cut 210 and the second cut 220 of the insulating film 100 and the first folded edge portion 120 are located on the same side of the first cut. When pulling the cut end 101, pulling the cut end 101 in the direction close to the first folded edge portion 120 can tear the first folded edge portion 120 away from the second surface of the battery.

[0069] And in this embodiment, the second folded edge portion 130 is located outside the first folded edge portion 120. Therefore, when tearing the first folded edge portion 120, the first folded edge portion 120 will also lift the second folded edge portion 130, thereby tearing the second folded edge portion 130 away from the second surface as well. This can prevent the situation where the first folded edge portion 120 has been torn away while the second folded edge portion 130 is still adhered to the battery, so as to improve the tearing efficiency.

[0070] In a further embodiment, the intersection of the first cut 210 and the second cut 220 is close to the first corner portion 111 on the outer surface of the first part 110, and the first corner portion 111 is located on the side of the first part 110 facing away from the first folded edge portion 120.

[0071] In some embodiments, the first cut 210 and the second cut 220 can intersect at the same point. That is to say, the starting end of the first cut 210 is located on the second cut 220, and the starting end of the second cut 220 is located on the first cut 210.

[0072] In other embodiments, the starting end of one of the first cut 210 and the second cut 220 is located on the other, and the starting end of one of the first cut 210 and the second cut 220 is located between the two ends of the other. For example, the starting end of the first cut 210 is located on the second cut 220, and the starting end of the first cut 210 is located between the two ends of the second cut 220; or, the starting end of the second cut 220 is located on the first cut 210, and the starting end of the second cut 220 is located between the two ends of the first cut 210.

[0073] In an alternative embodiment, both ends of the first incision 210 are respectively located on both sides of the second incision 220. That is to say, the starting end of the first incision 210 exceeds the second incision 220, and both ends of the second incision 220 are respectively located on both sides of the first incision 210. That is to say, the starting end of the second incision 220 exceeds the first incision 210.

[0074] In this embodiment, the starting end of the first incision 210 exceeds the second incision 220, and the starting end of the second incision 220 exceeds the first incision 210. In this way, the precision requirements for making the first incision 210 and the second incision 220 can be reduced; in addition, by using the method of this embodiment, four corners can be formed at the intersection of the first incision 210 and the second incision 220. After one of the corners is pulled and the insulating film 100 is broken, the other three corners can be pulled, thereby increasing the fault tolerance rate of tearing off the insulating film 100.

[0075] In an alternative embodiment, the power of the laser used to make the first incision 210 and the second incision 220 is 100 - 300W. Exemplarily, the power of the laser can be 100w, 120w, 150w, 200w, 205w, 260w, 290w, etc., and this application does not limit this.

[0076] If the power of the pulsed laser here is less than 100w, it may cause the first incision 210 and the second incision 220 to not penetrate the first part 110; if the power of the pulsed laser is greater than 300w, it may damage the battery. Therefore, in this embodiment, the power of the pulsed laser is controlled to be 100 - 300W, which can not only ensure that the first incision 210 and the second incision 220 penetrate the first part 110, but also will not damage the battery.

[0077] Please refer to Figure 2 and Figure 3 , in an alternative embodiment, before step S100, or after step S100 and before step S200, it further includes:

[0078] S300. Laser cleaning: Use a laser to clean the insulating film 100 to reduce the bonding strength of the adhesive layer between the insulating film 100 and the battery. It should be noted that the laser used here is flat-top light.

[0079] In this embodiment, laser cleaning of the insulating film 100 can reduce the bonding strength of the adhesive layer between the insulating film 100 and the battery. The cut end 101 is bonded to the first surface through the adhesive layer. After the first cut 210 and the second cut 220 are made, the cut end 101 is no longer restricted by other parts of the insulating film 100. Under the combined influence of the above two factors, the cut end 101 will warp up for easy pulling, which eliminates the need to pick at the cut end 101, simplifies the film tearing step, and improves the film tearing efficiency. Moreover, after weakening the bonding strength of the adhesive layer between the insulating film 100 and the battery, it is easier to tear off the insulating film 100.

[0080] Since laser cleaning reduces the adhesion between the insulating film 100 and the battery, some areas of the insulating film 100 will be detached from the battery, resulting in bubbles. The bubbles will weaken the laser energy. Therefore, in order to further reduce the difficulty of film tearing, in one embodiment of the present application, step S300 is placed between step S100 and step S200, that is, the first cut 210 and the second cut 220 are first made on the first part 110, and then the insulating film 100 is laser cleaned. That is to say, when the first cut 210 and the second cut 220 are made, the adhesion between the insulating film 100 and the battery has not been reduced yet, so the insulating film 100 will not be detached from the battery, and no bubbles will be generated between the two. In this way, it can be ensured that the first cut 210 and the second cut 220 penetrate the first part 110 to reduce the difficulty of film tearing.

[0081] In an alternative embodiment, the power of the laser used for cleaning is 500 - 2000W. Exemplarily, the laser power for cleaning can be 500W, 600W, 700W, 900W, 950W, 1000W, 1050W, 1100W, 1200W, 1300W, 1400W, 1600W, 1800W, 1950W, etc.

[0082] If the power of the laser for cleaning is less than 500W, the effect of reducing the bonding strength of the adhesive layer between the insulating film 100 and the battery is poor, and it is not easy to tear off the insulating film 100. If the power of the laser for cleaning is greater than 2000W, the adhesive layer may adhere to the battery housing and is not easy to detach from the battery housing, which will affect the subsequent process of pasting the insulating film 100 again. Therefore, in the present application, the power of the laser for cleaning is controlled to be 500 - 2000W, which can not only ensure the effect of reducing the bonding strength of the adhesive layer between the insulating film 100 and the battery, but also will not affect the subsequent process of pasting the insulating film 100 again.

[0083] In the above embodiments of the present application, the differences between the various embodiments are mainly described. As long as the different optimization features between the various embodiments are not contradictory, they can be combined to form a more optimal embodiment. Considering the simplicity of the text, it will not be elaborated here. The embodiments of the present application have been described above with reference to the accompanying drawings. However, the present application is not limited to the above specific implementation manners. The above specific implementation manners are merely illustrative rather than restrictive. Under the inspiration of the present application, those of ordinary skill in the art can also make many forms without departing from the purpose of the present application and the scope protected by the claims, and all of them fall within the protection scope of the present application.

Claims

1. A method for removing a battery insulating film, characterized in that: include: S100, laser cutting: using a laser to open a first incision and a second incision intersecting each other in a first portion of the insulating film, wherein the first portion is a portion of the insulating film covering a first surface of the battery, and the first surface is a surface with the largest area of ​​the battery; S200, manual film removal: tearing the incision end of the insulating film formed at the first intersection of the first incision and the second incision in a direction away from the first intersection; The shape of the laser spot used to make the first incision and the second incision is rectangular.

2. The removal method according to claim 1, characterized in that: The first portion is rectangular, the first intersection is close to a first corner of an outer surface of the first portion, and the first corner is any corner of the outer surface of the first portion.

3. The removal method according to claim 2, characterized in that: The outer surface of the first portion includes a first edge and a second edge adjacent to each other, the first corner is a corner close to a second intersection of the first edge and the second edge, and step S100 includes: S110, using a laser to open the first incision on the first portion along a direction parallel to the first edge, and to open the second incision on the first portion along a direction parallel to the second edge to intersect with the first incision.

4. The removal method according to claim 3, characterized in that: The outer surface of the first portion further comprises a third edge and a fourth edge disposed adjacent to each other, the third edge is parallel to the first edge, and the fourth edge is parallel to the second edge; The maximum distance between the first cutout and the fourth edge is less than ten millimeters, and the maximum distance between the second cutout and the third edge is less than ten millimeters.

5. The removal method according to claim 3, characterized in that: The distance between the first incision and the first edge is 10-20 mm, and the distance between the second incision and the second edge is 10-20 mm.

6. The removal method according to claim 1, characterized in that: The battery is a square battery, and the square battery further includes a second surface and a third surface, the third surface is arranged opposite to the first surface, and the second surface is arranged adjacent to the first surface and the third surface respectively; The insulating film further includes a second portion, a first folded edge portion and a second folded edge portion, the second portion covers the third surface, the first folded edge portion is bent relative to the first portion, the second folded edge portion is bent relative to the second portion, the first folded edge portion is adhered to the second surface, and at least a portion of the second folded edge portion is overlapped on the outer surface of the first folded edge portion; The cut end and the first folded edge are located on the same side of the first cut.

7. The removal method according to claim 1, characterized in that: Two ends of the first incision are respectively located on two sides of the second incision, and two ends of the second incision are respectively located on two sides of the first incision.

8. The removal method according to claim 1, characterized in that: The power of the laser used to make the first incision and the second incision is 100-300W.

9. The removal method according to any one of claims 1 to 8, characterized in that: Before step S100, or after step S100 and before step S200, the method further includes: S300, laser cleaning: using laser to clean the insulating film to reduce the bonding strength of the adhesive layer between the insulating film and the battery.

10. The removal method according to claim 9, characterized in that: The power of the laser used for cleaning is 500 to 2000W.

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