CN115799595B - Square shell battery back-shape film coating method - Google Patents
Square shell battery back-shape film coating method Download PDFInfo
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- CN115799595B CN115799595B CN202211506240.XA CN202211506240A CN115799595B CN 115799595 B CN115799595 B CN 115799595B CN 202211506240 A CN202211506240 A CN 202211506240A CN 115799595 B CN115799595 B CN 115799595B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
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Abstract
The invention provides a square shell battery back-type coating method, wherein during coating, the front side surface and the left and right large surfaces of a battery are firstly adhered, an insulating film belt is cut, then the rear side surface of the battery is lapped, then the insulating film extending on the front side surface and the rear side surface or the left and right large surfaces outside the bottom surface of the battery is sheared, then the bottom surface of the battery is folded and adhered according to the shearing position, then the top surface of the battery is folded and adhered, and finally a top sheet is adhered; the edge trimming treatment can ensure that the problem of rising of folded surfaces can not occur after folding and pasting. The top surface of the insulating film can be pressed by the top surface of the top surface-pasting sheet, so that edge trimming of the top surface is avoided, and the operation flow is simplified. The tape is used in the case where a rolled insulating film tape is used and needs to be cut. The square-shell battery loop type coating method has the advantages of wide coating application range, good coating quality and high coating efficiency.
Description
Technical Field
The invention belongs to the technical field of coating of square-shell batteries, and particularly relates to a square-shell battery loop-type coating method.
Background
The square shell battery (hereinafter referred to as battery), please see fig. 1, is divided into a top surface 11, a bottom surface 19, a left large surface 12, a right large surface (not shown), a front side surface (not shown) and a rear side surface 13 according to the upward posture of the liquid injection port towards the front top surface, the positive pole 14, the liquid injection port 15, the explosion-proof window 16, the two-dimensional code 17 and the negative pole 18 are distributed from front to back on the central line of the top surface 11 (the exposed surface of the top cover) of the conventional battery, the battery size is represented by L, the width is represented by W, the height is represented by H, and the unit is mm. In the process of manufacturing the battery, insulating films (sheets) are required to be coated on six shell surfaces of a metal shell of the bare cell, so that the bare cell is a coated battery to play a role in electrical isolation (insulation) and also play a role in corrosion prevention and decoration. According to the film-coated form that the film-coated batteries are required to be insulated from each other when the battery module is assembled and the film-coated batteries are in contact with the module film-coated shell, the positive pole 14, the liquid injection port 15, the explosion-proof window 16, the two-dimensional code 17 and the negative pole 18 are distributed on the battery top surface 11, and are folded and adhered bare surfaces, the left large surface 12, the right large surface (not shown), the front side surface (not shown), the rear side surface 13 and the bottom surface 19 of the battery are all covered with insulating films, the exposed whole surfaces of the non-shell surfaces are generally covered on the left large surface 12, the right large surface (not shown), the front side surface (not shown), the rear side surface 13 and the bottom surface 19 of the battery, if the battery module is assembled, and only one or some other surfaces have insulating requirements, the other surfaces need to be covered with the whole surfaces, and one or some surfaces can be covered with edges of the surfaces, and the middle parts of the exposed surfaces can be kept to be half covered surfaces of the shell surfaces, so that insulating film materials can be saved.
Typical insulating film materials are made in two forms: the insulating films Zhang Diefang are stacked together and supplied as a double-layered film roll on a roll, and the insulating film roll is supplied as a double-layered film roll. The insulating film sheet can be used after being torn off before the film is coated, and the insulating film strip is required to be peeled off before the film is coated and cut into insulating film strip sections in the film coating process. The insulating film is called as an insulating film at the position where the insulating film sheet and the insulating film belt section are not needed to be distinguished, the insulating film (sheet) is made of polyethylene terephthalate (also called as PET), the insulating film is generally 0.08-0.15 mm thick, and the insulating sheet is generally 0.15-0.5 mm thick, so that the insulating film has excellent insulativity, high temperature resistance, flame retardance, heat dissipation and stretching rigidity; the adhesive is a polymer adhesive (one or more of polyvinylidene fluoride-hexafluoropropylene copolymer, polyvinylidene fluoride, polymethyl methacrylate, polyethylene oxide, polyacrylonitrile, polystyrene, polyvinyl acetate and polyvinylpyrrolidone) with thickness of 0.01-0.05 mm, can be accelerated to solidify when being irradiated by Ultraviolet (UV), and has excellent insulativity, high temperature resistance, flame retardance, heat dissipation and adhesiveness; the release film is made of polyethylene (also called PE) and is generally 0.05-0.1 mm thick.
Battery coating requirements:
the battery is covered with six shell surfaces according to the requirement, the top surface of the battery is generally a bare surface, the left large surface, the right large surface, the front side surface, the rear side surface and the bottom surface of the battery are all fully covered surfaces, and the battery can also be provided with a full covered surface on one part of the left large surface, the right large surface, the front side surface, the rear side surface and the bottom surface, and the rest part is a half covered surface;
(II) film tension of 1.5+ -0.5 kgf and film sticking pressure of 15+ -5 kgf;
(III) film pasting precision comprises trimming precision +/-1 mm;
and fourthly, the creepage distance between any point on the coated surface (except the top surface) of the battery after coating and the surface of the battery shell is required to be more than or equal to 4mm, and 4mm is called as the minimum safe creepage distance. Therefore, the shortcut (the sum of a straight line distance or the shortest multi-section straight line distance) of the bonding area where the film and the film are overlapped, which is required to pass through, reaches any point on the edge of the exposed edge (including the original edge, the cutting edge, the notch edge and the notch edge of the insulating film) of the full wrapping surface, namely the wrapping surface is called the creepage distance from the film edge to the shell surface, and the creepage distance is required to be more than or equal to 4mm; any shell surface of the full wrapping surface reaching the whisker bare surface or the half wrapping surface needs to pass through a shortcut (sum of a section of straight line distance or the shortest multi-section of straight line distance) from a film of the full wrapping surface to a bonding area of the whisker bare surface or the half wrapping surface, and the creepage distance from the full wrapping surface to the shell surface of the different whisker bare surface or the half wrapping surface needs to be more than or equal to 4mm.
Fifth, the length and width dimensions are not increased significantly so as not to affect future battery modules;
and (six) no exposure (except intentional exposure), glue opening, air bubbles, wrinkles, corners, warping, scratches and dirt.
Disclosure of Invention
Aiming at the technical problems, the invention provides a square-shell battery back-shaped coating method which is simple in process and meets the coating requirements in the background technology.
The invention adopts long insulating film strips to cut into insulating film strip sections (hereinafter collectively called insulating films) to be coated on the shell surface of a bare square shell battery in the coating process, and the operation procedures and the technological process of the square shell battery back-coating method comprise the following steps:
paste the leading flank: the battery is firstly attached by an insulating film tape with left and large sides facing upwards and front side facing forwards and crossed with the front side along the length direction, so that the head of the insulating film tape attached to the front side extends out of the first length L of the front side m1 Extending the insulating film tape adhered to the front side surface to a first width W m1 Extending a second width W of the top surface m2 ；
Sticking left and right big faces: then the head and tail of the insulating film are respectively paved and stuck on the left large surface and the right large surface, so that the head of the insulating film is pressed according to the second length L m2 Extending out of the rear side;
cutting: cutting off the tail of the insulating film to extend the tail of the insulating film on the left large surface or the right large surface to a third length L of the rear surface m3 ；
Folding and pasting the rear side face: respectively folding and pasting the insulating film tape heads and the insulating film tape tails extending out of the rear side surfaces on the left large surface and the right large surface onto the rear side surfaces, so that the insulating film heads and the insulating film tape tails are mutually overlapped to form a first overlap area to cover the rear side surfaces entirely;
edge cutting: cutting the insulating films extending out of the bottom surfaces on the left large surface and the right large surface respectively from the edges of the insulating films to the bottom surfaces at two preset positions, and forming four cutting openings when the insulating films extend out of the bottom surfaces on the left large surface and the right large surface to form cutting surface insulating films, and reserving the insulating films extending out of the bottom surfaces on the front side surface and the rear side surface to form non-cutting surface insulating films; or the insulating films extending out of the bottom surfaces on the front side surface and the rear side surface are sheared from the edges of the insulating films to the bottom surfaces at two preset positions respectively, and four shearing openings are formed by extending to the preset distance from the bottom surfaces, so that the insulating films extending out of the bottom surfaces on the front side surface and the rear side surface become sheared insulating films, and the insulating films extending out of the bottom surfaces on the left large surface and the right large surface are reserved to become non-sheared insulating films;
folding and pasting a non-shearing surface: firstly, folding and pasting two non-shearing surface insulating films on the bottom surface to form a bottom insulating film, and enabling edge parts of the shearing openings, originally belonging to the shearing surface insulating films, connected with two sides of the two non-shearing surface insulating films to be toppled and pasted on the two shearing surface insulating films to form four overlapping areas of the insulating films, wherein the adhesive surfaces of the four insulating films are pasted with adhesive surfaces, the initial ends of the overlapping areas, which are positioned outside extension lines of the shearing openings, are right-angled triangles, and the hypotenuses of the right-angled triangles are folding edges; the two bottom insulating films are adhered on the bottom surface and overlap with each other to form a second overlap region to cover the bottom surface entirely or not overlap with each other to cover the bottom surface incompletely;
Folding and pasting a shearing surface: folding and pasting two shearing surface insulating films and the overlapping region onto the bottom surface and/or the bottom insulating film to form a surface layer insulating film, pasting the two surface layer insulating films onto the bottom surface and/or the bottom insulating film and overlapping each other to form a third overlapping region to cover the bottom surface entirely or not overlapping each other to cover the bottom surface entirely; the overlapping area of the surface layer insulating film is only folded and covered on the bottom layer insulating film and is not adhered on the bottom layer insulating film, and the folded edge of the surface layer insulating film is exposed on the bottom layer insulating film;
folding and pasting the top surface: folding and pasting insulating films extending out of the top surfaces on the left large surface and the right large surface, the front side surface and the rear side surface on the top surfaces;
sticking a top sheet: and attaching a top insulating sheet to the folded insulating film on the top surface.
Further, when the edges are cut, the vertical distance from the edge of each cut to the adjacent non-cut surface insulating film is equal to the distance from the bottom point of the cut to the bottom surface, and is the first distance A, when the width W of the battery is more than or equal to 8mm, the parts of the four overlapping areas outside the extension line of the cut are attached to form four isosceles right triangles with right angles of side length A, the A is more than or equal to 4mm, and the shortest distance J from the bottom point of the four cuts on the surface layer insulating film on the bottom surface of the battery to the shell surface of the bottom surface of the battery after the cut is folded and attached meets J is more than or equal to 4mm.
Further, when the cell width W is not less than 8mm, the insulating film tape head extends to the second length L of the rear side face m2 Satisfies the L of 4mm less than or equal to m2 W is less than or equal to W, and the tail of the insulating film extends to the third length L of the rear side surface m3 Satisfies the L of 4mm less than or equal to m3 W is less than or equal to W, and W+4mm is less than or equal to L m2 +L m3 The distance D between the head edge of the lapped insulating film and the tail edge of the insulating film is less than or equal to 2W 3 Satisfy D 3 ≥4mm。
Further, when the cell width W is not less than 8mm, the insulating film tape extends beyond the first width W of the bottom surface m1 Satisfy 1/2W+2mm. m1 W is less than or equal to W, after the non-shearing surface is folded and stuck, the original edges of the two bottom insulating films stuck on the bottom surface are mutually overlapped, and the distance D between the two overlapped original edges 1 Satisfy D 1 More than or equal to 4mm, or after the folding, pasting and shearing, the original edges of the two surface layer insulating films are mutually overlapped, and the distance D between the two overlapped original edges 2 Satisfy D 2 ≥4mm。
Further, when the cell width W is not less than 8mm and the minimum width B of the edge plane of the top surface is not less than 4mm, the insulating film tape extends out of the second width W of the top surface m2 Meet the W of 4mm less than or equal to m2 And after the top surface is folded and pasted, the distance C from any point of the insulating film surfaces on the left large surface and the right large surface, the front side surface and the rear side surface of the battery to the shell surface of the top surface of the battery is more than or equal to 4mm.
Further, the height of the battery is H, and when the width W of the battery is more than or equal to 8mm and the minimum width B of the edge plane of the top surface is more than or equal to 4mm, the width W of the insulating film m Satisfies H+1/2W+6mm.ltoreq.W m ≤H+W+B。
Further, the length of the battery is L, and when the width W of the battery is more than or equal to 8mm, the insulating film tape head extends out of the first length L of the front side surface m1＝ L+L m2 And satisfies L+4mm.ltoreq.L m1 L+W is less than or equal to L, and after the tape is cut, the length L of the insulating film tape required by a battery is coated m Satisfy 2L+2W+4mm.ltoreq.L m ≤2L+3W。
The square shell battery loop type coating method has the beneficial effects that:
during coating, firstly pasting the front side surface and the left and right large surfaces of the battery, cutting the insulating film belt, then lapping the rear side surface of the battery, trimming the insulating film extending on the front and rear side surfaces or the left and right large surfaces outside the bottom surface of the battery, then folding and pasting the bottom surface of the battery according to the trimming position, folding and pasting the top surface of the battery, and finally pasting the top sheet; the edge trimming treatment can ensure that the problem of rising of folded surfaces can not occur after folding and pasting. The top surface of the insulating film can be pressed by the top surface of the top surface-pasting sheet, so that edge trimming of the top surface is avoided, and the operation flow is simplified. The tape is used in the case where a rolled insulating film tape is used and needs to be cut. The square-shell battery loop type coating method has the advantages of wide coating application range, good coating quality and high coating efficiency.
Drawings
FIG. 1 is a schematic view of a square battery structure;
FIG. 2 is a process flow diagram of a battery wrap-around method of the present invention;
FIG. 3 is a process flow diagram of a battery wrapping method according to an embodiment of the invention;
fig. 4 is a schematic view of a front side patch and a left and right large sides of a battery wrapping method according to a first embodiment of the present invention;
fig. 5 is a schematic side view of a battery wrapping method according to the first embodiment of the present invention after folding;
fig. 6 is a schematic diagram of front and rear sides of a battery wrapping method according to the first embodiment of the present invention;
fig. 7 is a schematic view of left and right sides of a battery wrapping method according to the first embodiment of the present invention;
fig. 8 is a schematic diagram of front and rear sides of a folding and pasting method of a battery wrapping film according to a first embodiment of the present invention;
fig. 9 is a schematic diagram of a top surface of a wrapping fold of a battery wrapping method according to an embodiment of the present invention;
fig. 10 is a schematic diagram of a battery wrapping method top sheet according to the first embodiment of the present invention;
FIG. 11 is a process flow diagram of a battery wrapping method according to a second embodiment of the invention;
FIG. 12 is a schematic view of a left and right side view of a battery wrapping method according to a second embodiment of the present invention;
fig. 13 is a schematic diagram of front and rear sides of a folding and pasting method of a battery wrapping film according to a second embodiment of the present invention;
fig. 14 is a schematic view of a left and right side of a battery wrapping method according to a second embodiment of the present invention.
Reference numerals illustrate:
100. A battery; 11. a top surface; 12. left large face; 13. a rear side; 14. a positive electrode post; 15. a liquid injection port; 16. an explosion-proof window; 17. a two-dimensional code; 18. a negative electrode column; 19. a bottom surface; 20. a first overlap region; 21. cutting the mouth; 22. a coincidence region; 23. a second overlap region; 24. folding edges; 25. a third overlap region; 26. side exposure lapping edges; 27. a first bottom exposed overlap; 28. the second bottom is exposed to the scrap.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
In the description of the present invention, it should be noted that, directions or positional relationships indicated by terms such as "center", "upper", "lower", "left", "right", "front", "rear", "vertical", "horizontal", "inner", "outer", etc., are based on those shown in the drawings, are merely for convenience of description and simplification of the description, and do not indicate or imply that the apparatus or elements referred to must have a specific direction, be configured and operated in the specific direction, and thus should not be construed as limiting the present invention; the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance; furthermore, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be directly connected or indirectly connected through an intermediate medium, and can be the communication between the two parts. The specific meaning of the terms in the present invention will be understood by those of ordinary skill in the art in specific detail.
The invention provides a square-shell battery loop type coating method, which adopts a long insulating film belt to meet the coating requirement of the square-shell battery in the background technology.
Referring to fig. 1 to 14, the operation procedure and the process flow of the square-shell battery loop-type coating method comprise:
s10, sticking the front side face: the battery 100 is first adhered by an insulating film tape with a left large surface 12 facing upwards and a front side surface (not marked) facing forwards and crossing the front side surface (not marked) along the length direction, so that the head of the insulating film tape adhered to the front side surface (not marked) extends out of the front side surface (not marked) for a first length L m1 (also called head length), the insulating film tape stuck on the front side (not shown) is extended to a first width W of the bottom surface 19 m1 (also called the edge-to-bottom width) and extends beyond the top surface 11 by a second width W m2 (also called edge-out top width);
s20, sticking left and right large surfaces: then the head and tail of the insulating film are respectively spread on the left large surface 12 and the right large surface (not labeled) to lead the head of the insulating film to be in accordance with the second length L m2 (also called the head-out rear side length) extends beyond the rear side 13;
s30, cutting: cutting the tail of the insulating film to extend the tail of the insulating film on the left large surface 12 or the right large surface (not shown) to a third length L of the rear surface 13 m3 (also called tail out posterior aspect length);
s40, folding and pasting the rear side face: the insulating film tape head and the insulating film tape tail which extend out of the rear side surface 13 on the left large surface 12 and the right large surface (not marked) are respectively folded and stuck on the rear side surface 13, so that the insulating film tape head and the insulating film tape tail are mutually overlapped to form a first overlap region 20 to entirely cover the rear side surface 13;
s50, edge cutting: cutting the insulating films extending out of the bottom surface 19 on the left large surface 12 and the right large surface (not marked) respectively at two preset positions from the edge of the insulating film to the bottom surface 19, and forming four cutting openings 21 extending to a preset distance from the bottom surface 19, so that the insulating films extending out of the bottom surface 19 on the left large surface 12 and the right large surface (not marked) become cut-surface insulating films, and the insulating films extending out of the bottom surface 19 on the front side surface (not marked) and the rear side surface 13 are reserved to be non-cut-surface insulating films; or the insulating films extending out of the bottom surface 19 on the front side surface (not marked) and the rear side surface 13 are respectively sheared at two preset positions from the edge of the insulating film to the bottom surface 19 and extend to a preset distance from the bottom surface 19 to form four shearing openings 21, so that the insulating films extending out of the bottom surface 19 on the front side surface (not marked) and the rear side surface become sheared insulating films, and the insulating films extending out of the bottom surface 19 on the left large surface 12 and the right large surface (not marked) are reserved to be non-sheared insulating films;
The vertical distance from the four cuts 21 to the non-cutting surface insulating film extending out of the bottom surface 19 on the adjacent front side surface (not shown) and rear side surface 13 or on the left large surface 12 and right large surface (not shown) is equal to the distance from the cuts 21 to the bottom surface 19, and is a first distance a;
s60, folding and pasting a non-shearing surface: folding and pasting two non-clipping surface insulating films extending out of the bottom surface 19 on the front side surface (not marked) and the rear side surface 13 or the left large surface 12 and the right large surface (not marked) to the bottom surface 19 to form a bottom insulating film, tilting and pasting the edge parts of clipping openings 21 originally belonging to clipping surface insulating films connected on two sides of the two non-clipping surface insulating films to the left large surface 12 and the right large surface (not marked) or the front side surface (not marked) and the rear side surface 13 on the two clipping surface insulating films extending out of the bottom surface 19 to form a superposition area 22 of four insulating films with adhesive surfaces for adhering insulating films, forming a right triangle at the initial end of the superposition area 22 outside the extension line of the clipping opening 21, wherein the hypotenuse of the right triangle is a folding edge 24; two bottom insulating films extending out of the bottom surface 19 on the front side surface (not shown) and the rear side surface 13 or on the left large surface 12 and the right large surface (not shown) are adhered to the bottom surface 19 and overlap each other to form a second overlap region 23 which covers the bottom surface 19 entirely or which does not overlap each other to cover the bottom surface 19 incompletely;
The parts of the four overlapping areas 22 outside the extension lines of the shears 21 are fit to form four isosceles right triangles with right side lengths being the distance A.
S70, folding, pasting and cutting surfaces: two shearing surface insulating films extending out of the bottom surface 19 on the front side surface (not labeled) and the rear side surface 13 or the left large surface 12 and the right large surface (not labeled) are folded and stuck on the bottom insulating film or the bottom surface 19 together with the superposition area 22 to form a surface insulating film, and the two surface insulating films are stuck on the bottom insulating film or the bottom surface 19 and mutually lapped to form a third lapping area 25 to fully cover the bottom surface 19 or not mutually lapped to not fully cover the bottom surface 19; wherein, the overlapping area 22 of the surface insulating film is only folded and covered on the bottom insulating film and is not adhered on the bottom insulating film, and the folded edge 24 of the surface insulating film is exposed on the bottom insulating film;
the folded edge 24 is preferably short and not long as the hypotenuse of the isosceles right triangle, and the first distance a is preferably small and not large as the right side of the isosceles right triangle.
The non-sheared surface is folded and stuck firstly, so that the edge part of the sheared edge 21 originally belonging to the sheared surface insulating film is inclined and folded on the sheared surface insulating film to form an overlapping area 22, and then the sheared surface is folded and stuck, so that the sheared surface insulating film is folded and stuck to the bottom insulating film on the bottom surface 19, and meanwhile, the overlapping areas 22 except the overlapping areas 22 at the isosceles right triangle are tucked and hidden.
The non-sheared insulation films extending out of the bottom surface 19 on the front side (not labeled) and the rear side 13 or on the left large side 12 and the right large side (not labeled) are folded and adhered to the bottom surface 19 to form a bottom insulation film, the bottom insulation films are mutually overlapped to form a second overlapping region 23 to fully cover the bottom surface 19 or mutually not overlapped to fully cover the bottom surface 19, and then the sheared insulation films extending out of the bottom surface 19 on the left large side 12 and the right large side (not labeled) or on the front side (not labeled) and the rear side 13 are folded and adhered to the bottom insulation films on the bottom surface 19 or also the bottom surface 19 to form a surface insulation film, so that the surface insulation films are mutually overlapped to form a third overlapping region 25 to fully cover the bottom surface 19 or mutually not overlapped to fully cover the bottom surface 19.
S80, folding and pasting the top surface: folding and attaching insulating films extending out of the top surface 11 on the left large surface 12 and the right large surface (not labeled), on the front side surface (not labeled) and on the rear side surface 13 to the top surface 11;
s90, sticking a top sheet: the top cover of the top-insulating sheet alignment battery 100 is attached to the folded insulating film on the top surface 11.
Specifically, when the edge is cut S50, the first distance a is greater than or equal to 4mm, so that after the edge is folded and stuck to the cut surface S70, the bottom points of the four cuts 21 on the surface insulating film on the bottom surface 19 of the battery 100 are also the opening points of the four folded edges 24 of the four isosceles right triangle hypotenuses, and the creepage distance J (also called the edge-cutting distance) to the shell surface of the bottom surface 19 of the battery 100 becomes the shortest creepage distance between the edge of the exposed cut 21 of the surface insulating film on the bottom surface 19 of the battery 100 and the folded edge 24 to the shell surface of the bottom surface 19 of the battery 100, and J is greater than or equal to 4mm (the minimum safe creepage distance), thereby meeting the coating requirement.
Specifically, when the cell width W is greater than or equal to 8mm, the insulating film tape head extends to a second length L of the rear side m2 Satisfies the L of 4mm less than or equal to m2 W is less than or equal to W, and the tail of the insulating film extends to a third length L of the rear side surface m3 Satisfies the L of 4mm less than or equal to m3 The creepage distance from the insulating film surface on the left large surface 12 and the right large surface (not labeled) of the battery 100 to the shell surface of the rear side surface 13 of the battery 100 is more than or equal to 4mm (minimum safe creepage distance) after the rear side surface S40 is folded and pasted, and the creepage distance meets the coating requirement; at the same time, in order to prevent the insulating film on the left large face 12 and/or on the right large face (not labeled) from turning over the rear side face 13 to the opposite right large face (not labeled) or the left large face 12; W+4mm.ltoreq.L m2 +L m3 The tape head and the tape tail of the insulating film attached to the rear side surface 13 are overlapped with each other after the rear side surface S40 is folded and attached to 2W or less, the tape head edge or the tape tail edge (collectively referred to as the side exposed overlap 26) of the insulating film is exposed to the rear side surface 13 of the battery 100 after the rear side surface S40 is folded and attached, and the distance D between the tape head edge and the tape tail edge of the insulating film after the overlap is obtained 3 Becomes the creepage distance from the exposed lap 26 on the rear side 13 of the battery 100 to the housing surface of the rear side 13 of the battery 100, and D 3 And the thickness is more than or equal to 4mm (minimum safe creepage distance), and meets the coating requirement.
Specifically, when the cell width W is 8mm or more, the insulating film tape extends beyond the first width W of the bottom surface 19 m1 Satisfy 1/2W+2mm. m1 After the non-shearing surface S60 is folded and stuck, the original edges of the two bottom insulating films stuck on the bottom surface 19 are lapped with each other, and the distance D between the two lapped original edges 1 After the two bottom insulating films are covered by the folded and adhered sheared surface S70, the creepage distance from the original edge of the non-sheared insulating film (first exposed overlap edge 27) on the bottom surface 19 of the battery 100 to the shell surface of the bottom surface 19 of the battery 100 is still exposed, D 1 Not less than 4mm (minimum safe creepage distance), and meets the coating requirement; or after folding and pasting the sheared surface S70, the original edges of the insulating films of the two surface layers are lapped with each other, and the distance D between the two lapped original edges 2 Satisfy D 2 Is not less than 4mm and is also a scissors with exposed insulating films on two surface layers on the bottom surface 19 of the battery 100 after the scissors surface S70 is folded and stuckCreepage distance from original edge of surface insulation film (second exposed overlap edge 28 for short) to case surface of bottom surface 19 of battery 100, D 2 Not less than 4mm (minimum safe creepage distance), and meets the coating requirement; the bottom insulating film and the surface insulating film are combined to enable the bottom surface 19 of the battery 100 to be a full wrapping surface, and the exposed edges of the insulating film of the bottom surface 19 after the surface S70 is folded and pasted comprise the folded edges 24 and the edges of the notch 21 on the surface insulating film, and the creepage distance from the exposed original edges of all the insulating films to the shell surface of the bottom surface 19 of the battery 100 is more than or equal to 4mm (minimum safe creepage distance), so that the creepage distance meets the wrapping requirement.
Specifically, when the cell width W is 8mm or more and the minimum width B of the edge plane of the top surface is 4mm or more, the insulating film tape extends beyond the second width W of the top surface m2 Meet the W of 4mm less than or equal to m2 And after the top surface S80 is folded and pasted, the distances C from any point of the insulating film surfaces on the left large surface 12 and the right large surface (not marked) of the battery, the front side surface (not marked) and the rear side surface 13 to the shell surface of the top surface 11 of the battery 100 are more than or equal to 4mm (minimum safe creepage distance), and the coating requirements are met.
Further, the height of the battery is H, and when the width W of the battery is more than or equal to 8mm and the minimum width B of the edge plane of the top surface is more than or equal to 4mm, the width W of the insulating film m ＝H+W m1 +W m2 Not less than H+1/2W+2mm+4mm, but W m H+W+B is not more than H+1/2W+6mm not more than W m ≤H+W+B。
Further, the length of the battery is L, and when the width W of the battery is more than or equal to 8mm, the insulating film tape head extends out of the first length L of the front side surface m1＝ L+L m2 And satisfies L+4mm.ltoreq.L m1 L+W is less than or equal to L, and after the tape is cut, the length L of the insulating film tape required by a battery is coated m Satisfy 2L+2W+4mm.ltoreq.L m ≤2L+3W。
In order to save the insulating films, the insulating films extending from the bottom surface 19 on the front side surface (not shown), the rear side surface 13, the left large surface 12, and the right large surface (not shown) may be made shorter, but the bottom insulating films may not overlap each other, and the surface insulating films may not overlap each other, so that the bottom insulating films and the surface insulating films together form a half-wrapping surface of the bottom surface 19.
And the edge is cut S50, so that the problem that the folded surface is tilted after folding and pasting can be avoided. The top surface of the insulating film which is folded and stuck on the top surface 11 can be pressed by the top surface sticking sheet, so that the edge shearing of the top surface is avoided, and the operation flow is simplified. The slit tape S30 is used in the case where a rolled insulating film tape is used and cutting is required. The square-shell battery loop type coating method has the advantages of wide coating application range, good coating quality and high coating efficiency.
Example 1
Referring to fig. 1 and fig. 3 to fig. 10, the insulating film is a long insulating film tape fed by an insulating film tape drawing device, and the working procedure and the process flow of the square-shell battery loop-type film coating method comprise:
s10, sticking the front side face: referring to fig. 4, the battery 100 is first adhered with the left large surface 12 facing upwards and the front side (not labeled) facing forwards by an insulating film strip intersecting the front side (not labeled) in the longitudinal direction, so that the head of the insulating film strip adhered to the front side (not labeled) extends a first length L from the front side (not labeled) m1 (also called head length), the insulating film tape stuck on the front side (not shown) is extended to a first width W of the bottom surface 19 m1 (also called the edge-to-bottom width) and extends beyond the top surface 11 by a second width W m2 (also called edge-out top width);
S20, sticking left and right large surfaces: referring to FIG. 4, the tape head and tail are respectively spread on the left and right large surfaces 12 and (not labeled) to make the tape head of the insulating film have a second length L m2 (also called the head-out rear side length) extends beyond the rear side 13;
s30, cutting: cutting the tail of the insulating film to extend the tail of the insulating film on the left large surface 12 or the right large surface (not shown) to a third length L of the rear surface 13 m3 (also called tail out posterior aspect length);
s40, folding and pasting the rear side face: referring to fig. 5, the insulating film head and the insulating film tail extending from the rear side 13 on the left large surface 12 and the right large surface (not labeled) are respectively folded and attached to the rear side 13, so that the insulating film head and the insulating film tail overlap each other to form a first overlapping region 20 to entirely cover the rear side 13;
S50A, front and rear sides of edge cutting: referring to fig. 6, the insulation films extending from the bottom surface 19 on the front side (not labeled) and the rear side 13 are cut from the edges of the insulation films to the bottom surface 19 at two preset positions respectively, and four cuts 21 are formed by extending to a preset distance from the bottom surface 19, so that the insulation films extending from the bottom surface 19 on the front side (not labeled) and the rear side become cut insulation films, and the insulation films extending from the bottom surface 19 on the left large surface 12 and the right large surface (not labeled) remain as non-cut insulation films;
Referring to fig. 6, the vertical distance from each cutout 21 to the non-cutout insulating film extending from the bottom surface 19 on the adjacent left large surface 12 and right large surface (not shown) is equal to the distance from the cutout 21 to the bottom surface 19, which is a first distance a (also called the cutting edge equidistance).
S60A, folding and pasting left and right large surfaces: referring to fig. 7, first, two non-cutting surface insulating films extending out of a bottom surface 19 on a left large surface 12 and a right large surface (not labeled) are folded and stuck on the bottom surface 19 to form a bottom insulating film, edge parts of cutting openings 21, originally belonging to two cutting surface insulating films extending out of the bottom surface 19 on a front side surface (not labeled) and a rear side surface 13, of the two non-cutting surface insulating films are connected with two sides of the two non-cutting surface insulating films, and are folded and stuck on the two cutting surface insulating films extending out of the bottom surface 19 on the front side surface (not labeled) and the rear side surface 13, so that four insulating films are formed to be stuck with a superposition area 22 of the adhesive surface of the insulating films by the adhesive surface, the starting end of the superposition area 22, which is positioned outside the extension line of the cutting opening 21, is in an isosceles right triangle, and the hypotenuse of the isosceles right triangle is a folded edge 24; two bottom insulating films extending out of the bottom surface 19 on the left large surface 12 and the right large surface (not labeled) are adhered to the bottom surface 19 and overlap each other to form a second overlapping region 23 which covers the bottom surface 19 entirely;
It should be noted that, please refer to fig. 7, the portions of the four overlapping regions 22 located outside the extension line of the scissors 21 are fit to form four isosceles right triangles with right angles and sides being the distance a.
S70A, folding the front and rear sides, please see FIG. 8: folding and attaching two cut-surface insulating films extending out of the bottom surface 19 on the front side surface (not labeled) and the rear side surface 13 together with the superposition area 22 to the bottom insulating film to form a surface insulating film, wherein the two surface insulating films are adhered to the bottom insulating film but are not overlapped with each other; wherein, the overlapping area 22 of the surface insulating film is only folded and covered on the bottom insulating film and is not adhered on the bottom insulating film, and the folded edge 24 of the surface insulating film is exposed on the bottom insulating film;
the folded edge 24 is preferably short and not long as the hypotenuse of the isosceles right triangle, and the first distance a is preferably small and not large as the right side of the isosceles right triangle.
Referring to fig. 7 and 8, the left and right large faces S60A are folded and attached first, so that the portions of the edges of the two cut-face insulating films extending from the bottom face 19, which originally belong to the front side face (not shown) and the rear side face 13, are folded and tilted to form the overlapping areas 22 on the two cut-face insulating films extending from the bottom face 19 on the front side face (not shown) and the rear side face 13, and then the front and rear side faces S70A are folded and attached, so that the two cut-face insulating films extending from the bottom face 19 on the front side face (not shown) and the rear side face 13 are folded and attached to the bottom insulating films on the bottom face 19, and the overlapping areas 22 except the overlapping areas 22 on the isosceles right triangle are hidden.
Referring to fig. 7 and 8, firstly, non-cut insulating films extending from the bottom surface 19 on the left large surface 12 and the right large surface (not labeled) are folded and adhered to the bottom surface 19 to form a bottom insulating film, the bottom insulating films are lapped to form a second lapping region 23 to fully cover the bottom surface 19, and then, the cut insulating films extending from the bottom surface 19 on the front side (not labeled) and the rear side 13 are folded and adhered to the bottom insulating films on the bottom surface 19 to form a surface insulating film, so that the surface insulating films are not lapped.
S80, folding and pasting the top surface: referring to fig. 9, insulating films extending from the top surface 11 on the left large surface 12 and the right large surface (not labeled), on the front side surface (not labeled), and on the rear side surface 13 are folded and attached to the top surface 11; because the length of the insulating film extending outside the top surface 11 is very short, the insulating film can be directly folded and stuck without trimming.
S90, sticking a top sheet: referring to fig. 10, a top cover of a top insulating sheet aligned to a battery 100 is attached to an insulating film on a top surface 11 after folding and attaching, a positive pole 14, a liquid injection port 15, an explosion-proof window 16, a two-dimensional code 17 and a negative pole 18 are arranged on the top surface, the length and width dimensions of the top insulating sheet are consistent with those of the top surface, and hollow-out parts are arranged on the positions of the top insulating sheet corresponding to the positive pole 14, the liquid injection port 15, the explosion-proof window 16, the two-dimensional code 17 and the negative pole 18, so that the electrical isolation effect of the top insulating sheet can be ensured, and the use of the positive pole 14, the liquid injection port 15, the explosion-proof window 16, the two-dimensional code 17 and the negative pole 18 on the top surface can not be influenced.
Further, please refer to fig. 6, when the battery width W is greater than or equal to 8mm, the first distance a is greater than or equal to 4mm at the time of trimming S50; please refer to fig. 8, the bottom points of the four cutouts 21 on the surface insulating film on the bottom surface 19 of the battery 100 after the coating are made to be the opening points of the four folded edges 24 of the four isosceles right triangle hypotenuses, and the creepage distance J (also called the scissors base distance) from the bottom surface 19 of the battery 100 to the shell surface becomes the shortest creepage distance from the edges of the cutouts 21 exposed on the surface insulating film on the bottom surface 19 of the battery 100 after the coating and the folded edges 24 to the shell surface of the bottom surface 19 of the battery 100, and J is greater than or equal to 4mm (the minimum safe creepage distance), which meets the coating requirement.
Further, please refer to fig. 4 and 5, when the cell width W is greater than or equal to 8mm, the insulating film head extends beyond the second length L of the rear side 13 m2 Satisfies the L of 4mm less than or equal to m2 W is less than or equal to W, and the tail of the insulating film extends to a third length L of the rear side surface 13 m3 Satisfies the L of 4mm less than or equal to m3 The creepage distance from the insulating film surface on the left large surface 12 and the right large surface (not labeled) of the battery 100 to the shell surface of the rear side surface 13 of the battery 100 is more than or equal to 4mm (minimum safe creepage distance) after the rear side surface S40 is folded and pasted, and the creepage distance meets the coating requirement; at the same time, in order to prevent the insulating film on the left large face 12 and/or on the right large face (not labeled) from turning over the rear side face 13 to the opposite right large face (not labeled) or the left large face 12; W+4mm.ltoreq.L m2 +L m3 After the rear side S40 is folded and stuck, please refer to FIG. 5, the head and tail of the insulating film tape stuck on the rear side 13 are overlapped with each other, the head edge or tail edge (collectively referred to as side exposed overlap 26) of the insulating film tape is exposed on the rear side 13 of the battery 100 after the rear side S40 is folded and stuck, and the distance D between the head edge and tail edge of the insulating film tape is obtained 3 (also referred to as a side lap distance) is a creepage distance from the exposed lap 26 on the rear side 13 of the battery 100 to the case surface of the rear side 13 of the battery 100, and D 3 And the thickness is more than or equal to 4mm (minimum safe creepage distance), and meets the coating requirement.
Further, please refer to fig. 4, when the cell width W is greater than or equal to 8mm, the insulating film tape extends beyond the first width W of the bottom surface 19 m1 Meet the requirement of 1/2W+2mm. m1 ≤W，After folding and attaching the left and right large faces S60A, the original edges of the two bottom insulating films attached to the bottom face 19 are overlapped with each other, see FIG. 7, and the distance D between the original edges of the two overlapped insulating films 1 (also called bottom lap distance), which is the creepage distance from the original edge (also called first bottom lap 27) of one non-sheared insulating film still exposed on the two bottom insulating films on the bottom surface 19 of the battery 100 to the shell surface of the bottom surface 19 of the battery 100, after the two bottom insulating films are laminated on the two bottom insulating films by the folding front and rear side surfaces S70A 1 Not less than 4mm (minimum safe creepage distance), and meets the coating requirement; referring to fig. 8, the bottom insulating film and the top insulating film are combined to make the bottom surface 19 of the battery 100 become a full wrapping surface, and the exposed edges of the insulating film of the bottom surface 19 after folding the front and rear side surfaces S70A include the folded edge 24 and the edge of the cutout 21 on the top insulating film, and the creepage distance from the exposed original edges of all the insulating films to the shell surface of the bottom surface 19 of the battery 100 is greater than 4mm, which meets the wrapping requirement.
Further, please refer to fig. 4 and 9, when the cell width W is greater than or equal to 8mm and the minimum width B of the top surface edge plane is greater than or equal to 4mm, the insulating film tape extends beyond the second width W of the top surface 11 m2 (also called edge width of top) satisfies W of 4mm m2 After the top surface S80 is folded and pasted, the creepage distance C (also called top edge distance) from any point of the insulating film surfaces on the left large surface 12 and the right large surface (not labeled), the front side surface (not labeled) and the rear side surface 13 of the battery 100 to the shell surface of the top surface 11 of the battery 100 meets the requirements of C not less than 4mm (minimum safe creepage distance) and meets the coating requirements.
Further, please refer to fig. 4, the battery height is H, when the battery width W is not less than 8mm, the minimum width B of the top surface edge plane is not less than 4mm, the insulating film width W m ＝H+W m1 +W m2 Not less than H+1/2W+2mm+4mm, but W m H+W+B is not more than H+1/2W+6mm not more than W m ≤H+W+B。
Further, please refer to fig. 4, the battery length is L, and when the battery width W is greater than or equal to 8mm, the insulating film head extends to a first length L of the front side (not shown) m1＝ L+L m2 And satisfies L+4mm.ltoreq.L m1 L+W, and after tape cutting, coating an insulating film tape length L required for a battery 100 m Satisfy 2L+2W+4mm.ltoreq.L m ≤2L+3W。
In order to save the insulating films, the insulating films extending from the bottom surface 19 on the front side surface (not shown), the rear side surface 13, the left large surface 12, and the right large surface (not shown) may be made shorter, but the bottom insulating films may not overlap each other, and the surface insulating films may not overlap each other, so that the bottom insulating films and the surface insulating films together form a half-wrapping surface of the bottom surface 19.
The edge S50A can ensure that the problem of upwarping of the folded surface can not occur after folding and pasting. The top surface of the insulating film which is folded and stuck on the top surface 11 can be pressed by the top surface sticking sheet, so that the edge shearing of the top surface is avoided, and the operation flow is simplified. The tape is used in the case where a rolled insulating film tape is used and needs to be cut. The square-shell battery loop type coating method has the advantages of wide coating application range, good coating quality and high coating efficiency.
Example two
Referring further to fig. 1 and 11 to 14, unlike the first embodiment, the trimming and folding operation procedure and the process flow are specifically: the left and right large faces of the edge are cut, the front and rear side faces of the edge are folded, and other operation procedures and technological processes are identical to those of the first embodiment.
S50B, cutting the left and right large surfaces: referring to fig. 12, the insulation films extending from the bottom surface 19 on the left large surface 12 and the right large surface (not labeled) are sheared from the edges of the insulation films to the bottom surface 19 at two preset positions, and four shearing openings 21 are formed by extending to a preset distance from the bottom surface 19, so that the insulation films extending from the bottom surface 19 on the left large surface 12 and the right large surface (not labeled) become sheared insulation films, and the insulation films extending from the bottom surface 19 on the front side surface (not labeled) and the rear side surface 13 remain as non-sheared insulation films.
Referring to fig. 12, the vertical distance from each cutout 21 to the adjacent front side (not shown) and rear side 13 is equal to the distance from the cutout 21 to the bottom surface 19, which is the first distance a.
S60B, folding and pasting the front side surface and the rear side surface: referring to fig. 13, two non-cutting surface insulating films extending out of a bottom surface 19 on a front side surface (not labeled) and a rear side surface 13 are folded and stuck on the bottom surface 19 to form a bottom insulating film, edge parts of cutting openings 21, which originally belong to two cutting surface insulating films extending out of the bottom surface 19 on a left large surface 12 and a right large surface (not labeled), connected with two sides of the two non-cutting surface insulating films are inclined and stuck on the two cutting surface insulating films extending out of the bottom surface 19 on the left large surface 12 and the right large surface (not labeled), so that four overlapping areas 22 of the insulating films with adhesive surfaces are formed, the starting ends of the overlapping areas 22, which are positioned outside extension lines of the cutting openings 21, form isosceles right triangles, and the oblique sides of the isosceles right triangles are folded edges 24; two bottom insulating films extending out of the bottom surface 19 on the front side (not shown) and the rear side 13 are adhered to the bottom surface 19 and are not overlapped with each other;
What needs to be stated is: please refer to fig. 13, the portions of the four overlapping regions 22 outside the extension lines of the scissors 21 are fit to form four isosceles right triangles with right sides being a distance a.
S70B, folding and pasting left and right large surfaces, please see FIG. 14: folding and pasting two cut-surface insulating films extending out of the bottom surface 19 on the left large surface 12 and the right large surface (not labeled) together with the superposition area 22 on the bottom insulating film and the bottom surface 19 to form a surface insulating film, pasting two surface insulating films on the bottom insulating film and the bottom surface 19 and mutually lapping to form a third lapping area 25 to fully cover the bottom surface 19; wherein, the overlapping area 22 of the surface insulating film is only folded and covered on the bottom insulating film and is not adhered on the bottom insulating film, and the folded edge 24 of the surface insulating film is exposed on the bottom insulating film;
the folded edge 24 is preferably short and not long as the hypotenuse of the isosceles right triangle, and the first distance a is preferably small and not large as the right side of the isosceles right triangle.
Referring to fig. 13 and 14, the front and rear side surfaces S60B are folded and attached to form overlapping areas 22 on the two clipping surface insulation films extending out of the bottom surface 19, which originally belong to the edges of the clipping openings 21 of the two clipping surface insulation films extending out of the bottom surface 19 on the left large surface 12 and the right large surface (not labeled), and then the left and right large surfaces S70B are folded and attached to each other to fold and attach the two clipping surface insulation films extending out of the bottom surface 19 on the left large surface 12 and the right large surface (not labeled) to the bottom insulation film on the bottom surface 19, and the overlapping areas 22 except the overlapping areas 22 on the isosceles right triangle are hidden.
Referring to fig. 13 and 14, the non-sheared insulation films extending from the bottom surface 19 on the front side (not shown) and the rear side 13 are folded and adhered to the bottom surface 19 to form a bottom insulation film, so that the bottom insulation films do not overlap each other, and then the sheared insulation films extending from the bottom surface 19 on the left large surface 12 and the right large surface (not shown) are folded and adhered to the bottom insulation film on the bottom surface 19 and also to form a surface insulation film on the bottom surface 19, so that the surface insulation films overlap each other to form a third overlapping region 25.
The front and rear sides S60B are folded and pasted first and then the left and right large sides S70B are folded and pasted, see fig. 13 and 14, because the left large side 12 and the right large side (not marked) are longer than the front side (not marked) and the rear side 13, the cut-surface insulating films extending out of the bottom surface 19 on the left large side 12 and the right large side (not marked) which are folded and pasted relatively wide are covered on the non-cut-surface insulating films extending out of the bottom surface 19 on the front side (not marked) and the rear side 13 which are folded and pasted relatively narrow, in other words, the wide cut-surface insulating films extending out of the bottom surface 19 on the long left large side 12 and the right large side (not marked) are covered on the narrow non-cut-surface insulating films extending out of the bottom surface 19 on the short front side (not marked) and the rear side 13, so that the problem that the cut-surface is easy to be glued can be avoided is generally to cut by using the insulating films with long sides, i.e. the cut-surface insulating films extending out of the short sides are selected from the left large side 12, the upper large side (not marked) and the front side (not marked) insulating films extending out of the front side (not shown) are covered on the front side insulating films.
Further, please refer to fig. 4, when the cell width W is not less than 8mm, the insulating film tape extends beyond the first width W of the bottom surface 19 m1 Meet the requirement of 1/2W+2mm. m1 W is less than or equal to W, please see FIG. 13, after folding and pasting the front and rear side surfaces S60B, the original edges of the two bottom insulating films pasted on the bottom surface 19 are not overlapped with each other, please see FIG. 14, but after folding and pasting the left and right large surfaces S70B, the original edges of the two surface insulating films pasted on the bottom insulating film are overlapped with each other, and the distance D between the original edges of the two insulating films after being overlapped 2 (also called as face lap distance), which is the original edge of one cut-out insulating film exposed from two surface insulating films on the bottom surface 19 of the battery 100 after folding and pasting the left and right large faces S70B (also called as second bottom exposed lap edge)28 Creepage distance D) to the case surface of bottom surface 19 of battery 100 2 Not less than 4mm (minimum safe creepage distance), and meets the coating requirement; referring to fig. 14, the bottom insulating film and the top insulating film are combined to make the bottom surface 19 of the battery 100 become a full wrapping surface, and the exposed edges of the insulating film of the bottom surface 19 after folding and pasting the left and right large surfaces S70B include the folded edge 24 and the edge of the cutout 21 on the top insulating film, and the creepage distance from the exposed original edge of all the insulating films to the shell surface of the bottom surface 19 of the battery 100 is not less than 4mm (the minimum safe creepage distance), which meets the wrapping requirement.
And the edge S50B is cut, so that the problem that the folded surface is tilted after folding and pasting can be avoided.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.
Claims (7)
1. The square shell battery back-shaped coating method is characterized by comprising the steps of coating an insulating film on a shell surface of a bare square shell battery, wherein the battery length is L, the battery width is W, and the battery height is H, and the square shell battery back-shaped coating method comprises the following steps:
paste the leading flank: the battery is firstly attached by an insulating film tape with left and large sides facing upwards and front side facing forwards and crossed with the front side along the length direction, so that the head of the insulating film tape attached to the front side extends out of the first length L of the front side m1 Extending the insulating film tape adhered to the front side surface to a first width W m1 Extending a second width W of the top surface m2 ；
Sticking left and right big faces: then the head and tail of the insulating film are respectively paved and stuck on the left large surface and the right large surface, so that the head of the insulating film is pressed according to the second length L m2 Extending out of the rear side;
cutting: cutting off the tail of the insulating film to extend the tail of the insulating film on the left large surface or the right large surface to a third length L of the rear surface m3 ；
Folding and pasting the rear side face: respectively folding and pasting the insulating film tape heads and the insulating film tape tails extending out of the rear side surfaces on the left large surface and the right large surface onto the rear side surfaces, so that the insulating film heads and the insulating film tape tails are mutually overlapped to form a first overlap area to cover the rear side surfaces entirely;
edge cutting: cutting the insulating films extending out of the bottom surfaces on the left large surface and the right large surface respectively from the edges of the insulating films to the bottom surfaces at two preset positions, and forming four cutting openings when the insulating films extend out of the bottom surfaces on the left large surface and the right large surface to form cutting surface insulating films, and reserving the insulating films extending out of the bottom surfaces on the front side surface and the rear side surface to form non-cutting surface insulating films; or the insulating films extending out of the bottom surfaces on the front side surface and the rear side surface are sheared from the edges of the insulating films to the bottom surfaces at two preset positions respectively, and four shearing openings are formed by extending to the preset distance from the bottom surfaces, so that the insulating films extending out of the bottom surfaces on the front side surface and the rear side surface become sheared insulating films, and the insulating films extending out of the bottom surfaces on the left large surface and the right large surface are reserved to become non-sheared insulating films;
folding and pasting a non-shearing surface: firstly, folding and pasting two non-shearing surface insulating films on the bottom surface to form a bottom insulating film, and enabling edge parts of the shearing openings, originally belonging to the shearing surface insulating films, connected with two sides of the two non-shearing surface insulating films to be toppled and pasted on the two shearing surface insulating films to form four overlapping areas of the insulating films, wherein the adhesive surfaces of the four insulating films are pasted with adhesive surfaces, the initial ends of the overlapping areas, which are positioned outside extension lines of the shearing openings, are right-angled triangles, and the hypotenuses of the right-angled triangles are folding edges; the two bottom insulating films are adhered on the bottom surface and overlap with each other to form a second overlap region to cover the bottom surface entirely or not overlap with each other to cover the bottom surface incompletely;
Folding and pasting a shearing surface: folding and pasting two shearing surface insulating films and the overlapping region onto the bottom surface and/or the bottom insulating film to form a surface layer insulating film, pasting the two surface layer insulating films onto the bottom surface and/or the bottom insulating film and overlapping each other to form a third overlapping region to cover the bottom surface entirely or not overlapping each other to cover the bottom surface entirely; the overlapping area of the surface layer insulating film is only folded and covered on the bottom layer insulating film and is not adhered on the bottom layer insulating film, and the folded edge of the surface layer insulating film is exposed on the bottom layer insulating film;
folding and pasting the top surface: folding and pasting insulating films extending out of the top surfaces on the left large surface and the right large surface, the front side surface and the rear side surface on the top surfaces;
sticking a top sheet: attaching a top insulating sheet to the folded insulating film on the top surface;
when the width W of the battery is more than or equal to 8mm and the minimum width B of the edge plane of the top surface is more than or equal to 4mm,
the second length L of the insulating film tape head extending out of the rear side surface m2 Satisfies the L of 4mm less than or equal to m2 ≤W，
After the tape is cut, the tail of the insulating film extends out of the third length L of the rear side surface m3 Satisfies the L of 4mm less than or equal to m3 W is less than or equal to W, and W+4mm is less than or equal to L m2 +L m3 ≤2W，
The insulating film tape extends to the first width W of the bottom surface m1 Satisfy 1/2W+2mm. m1 ≤W，
The insulating film tape extends beyond the second width W of the top surface m2 Meet the W of 4mm less than or equal to m2 ≤B，
The first length L of the insulation film tape head extending out of the front side surface m1＝ L+L m2 And satisfies L+4mm.ltoreq.L m1 ≤L+W。
2. The square-shell battery wrapping method according to claim 1, wherein when the edges are cut, the vertical distance from the edge of each cut to the adjacent non-cutting-surface insulating film is equal to the distance from the bottom point of the cut to the bottom surface, and the distance is a first distance A, so that the parts of the four overlapping areas outside the extension line of the cut are attached to form four isosceles right triangles with right angles and side lengths being A, wherein A is more than or equal to 4mm, and the shortest distance J from the bottom point of the four cuts on the surface insulating film on the bottom surface of the battery to the shell surface of the bottom surface of the battery after the edge is attached to the cut meets J is more than or equal to 4mm.
3. The square-shell battery loop-type coating method according to claim 2, wherein the distance D between the head edge of the lapped insulating film and the tail edge of the insulating film 3 Satisfy D 3 ≥4mm。
4. The square battery wrapping method according to claim 3, wherein after the non-cut surface is folded and stuck, the original edges of the two bottom insulating films stuck on the bottom surface are overlapped with each other, and the distance D between the overlapped two original edges 1 Satisfy D 1 More than or equal to 4mm, or after the folding, pasting and shearing, the original edges of the two surface layer insulating films are mutually overlapped, and the distance D between the two overlapped original edges 2 Satisfy D 2 ≥4mm。
5. The square-shell battery back-type coating method according to claim 4, wherein after the top surface is folded and pasted, the shell surface distance C from any point on the left large surface and the right large surface of the battery, the front side surface and the rear side surface to the top surface of the battery meets that C is more than or equal to 4mm.
6. The square battery wrapping method according to claim 5, wherein the insulating film has a width W m Satisfies H+1/2W+6mm.ltoreq.W m ≤H+W+B。
7. The square battery wrapping method according to claim 6, wherein after the tape is cut, the insulating film required for wrapping one battery has a tape length L m Satisfy 2L+2W+4mm.ltoreq.L m ≤2L+3W。
Priority Applications (1)
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