CN115911498A - U-shaped film coating method for square-shell battery - Google Patents

U-shaped film coating method for square-shell battery Download PDF

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Publication number
CN115911498A
CN115911498A CN202211506263.0A CN202211506263A CN115911498A CN 115911498 A CN115911498 A CN 115911498A CN 202211506263 A CN202211506263 A CN 202211506263A CN 115911498 A CN115911498 A CN 115911498A
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China
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front side
rear side
insulating film
insulating films
battery
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肖谊发
李军利
晏才维
董亮
谢仁贵
薛文博
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Shenzhen Yuchen Intelligent Equipment Co Ltd
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Shenzhen Yuchen Intelligent Equipment Co Ltd
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Priority to CN202211506263.0A priority Critical patent/CN115911498A/en
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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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Abstract

The invention provides a U-shaped film coating method for a square-shell battery, which comprises the steps of firstly pasting the bottom surface and the left and right large surfaces of the battery during film coating, cutting an insulating film tape, trimming the insulating film extending on the bottom surface outside the front side surface and the rear side surface of the battery or on the left and right large surfaces of the battery, folding and pasting the insulating film on the bottom surface or on the left and right large surfaces of the battery according to the trimming position, folding and pasting the top surface of the battery, and finally pasting a top plate; the edge cutting treatment can ensure that the problem that the folded and pasted surface is warped can not occur after the folding and pasting. The top pasting sheet can press the insulating film with the top surface folded and pasted, so that the top surface trimming is avoided, and the operation flow is simplified. The tape is used in the case of using an insulating film tape. The coating method for the U-shaped coating of the square-shell battery has the advantages of wide coating application range, good coating quality and high coating efficiency.

Description

U-shaped film coating method for square-shell battery
Technical Field
The invention belongs to the technical field of coating of square-shell batteries, and particularly relates to a U-shaped coating method of a square-shell battery.
Background
The square-casing battery (hereinafter referred to as a battery) is divided into six casing surfaces, namely a top surface 11, a bottom surface (not shown), 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 posture that a liquid injection port faces upwards towards the front top surface, and 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 distributed on the midline of the top surface 11 (top cover exposed surface) of the conventional battery from front to back, wherein the battery is represented by L in size, W in width and H in height, and the unit is mm. In the process of manufacturing the battery, insulating films (sheets) need to be adhered to six shell surfaces of a metal shell of the bare cell so that the bare cell becomes an envelope battery to play the role of electrical isolation (insulation) and also play the role of corrosion prevention and decoration. According to the coating form of the six shell surfaces, 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 top surface 11 of the coated battery and are required to be insulated from each other when the coated battery is assembled into a battery module, the six shell surfaces are required to be bare surfaces which are folded and adhered, 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 (not shown) of the battery are all the full-coating surfaces which are generally completely covered with the insulation film and are not exposed, one or some surfaces of 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 (not shown) of the battery are required to be coated into the full-coating surfaces if the insulation requirement is not met when the battery module is assembled, and only the other surface or some surfaces have the insulation requirement, and the other surface or some surfaces can be only covered on the edge of the surface, and the middle part of the surface of the other surface is kept as the half-coating surface of the shell surface, so as to save the insulation film material.
General insulating film materials are made in two forms: the single insulation film (insulation film) and long insulation film tape are generally adhered to release films with equal size on the surface with adhesive on the back surface, the insulation films are stacked together to form a stack for supplying, and the insulation film tape is wound on a reel to form a double-layer film tape roll for supplying. The insulating film strip can be used after the release film strip is peeled off before coating, and the insulating film strip needs to be peeled off before coating and is cut into insulating film strip sections in the coating process. The insulating film is called at the position where the insulating film and the insulating film strip section do not need to be distinguished, the material of the insulating film (sheet) is polyethylene terephthalate (also called PET), the thickness of the insulating film is generally 0.08-0.15 mm, the thickness of the insulating sheet is generally 0.15-0.5 mm, and the insulating film (sheet) has excellent insulativity, high temperature resistance, flame retardance, heat dissipation and stretching rigidity; the glue is a polymer binder (one or more of polyvinylidene fluoride-hexafluoropropylene copolymer, polyvinylidene fluoride, polymethyl methacrylate, polyethylene oxide, polyacrylonitrile, polystyrene, polyvinyl acetate and polyvinylpyrrolidone), has the thickness of 0.01-0.05 mm, can accelerate solidification when meeting ultraviolet light (UV) irradiation, and has excellent insulativity, high temperature resistance, flame retardance, heat dissipation and viscosity; the material of the release film is polyethylene (also called PE), and the thickness of the release film is generally 0.05-0.1 mm.
The coating requirement of the battery is as follows:
the battery comprises a battery body, six shell surfaces, a battery top surface, a battery left large surface, a battery right large surface, a battery front side surface, a battery rear side surface and a battery bottom surface, wherein the six shell surfaces are attached to the battery body according to requirements, the battery top surface is generally a beard bare surface, the battery left large surface, the battery right large surface, the battery front side surface, the battery rear side surface and the battery bottom surface are generally full-covered surfaces, or one part of the battery left large surface, the battery right large surface, the battery front side surface, the battery rear side surface and the battery bottom surface is a full-covered surface, and the rest part of the battery left large surface, the battery right large surface, the battery front side surface, the battery rear side surface and the battery bottom surface is a half-covered surface;
(II) the film tension is 1.5 +/-0.5 kgf, and the film sticking pressure is 15 +/-5 kgf;
(III) the film sticking precision comprises the trimming precision +/-1 mm;
and (IV) the requirement of the insulation property of the coating is that the creepage distance of any point on the coated surface (except the top surface) of the battery to the shell surface of the battery is required to be more than or equal to 4mm, and the creepage distance is called as the minimum safe creepage distance. Therefore, a short path (one section of linear distance or the sum of the shortest multiple sections of linear distances) from any point on the edge (including the original edge, the belt cutting edge, the notch edge and the notch edge) of the exposed edge of the insulating film on the full-envelope surface to a bonding area where the film and the film which are required to pass through any part of the envelope surface of the full-envelope surface are in lap joint is called the creepage distance from the film edge to the envelope surface and must be more than or equal to 4mm; and any shell surface from any point on the full-covering surface to the bare surface of the beard or the half-covering surface needs to pass through a short cut (one section of linear distance or the sum of the shortest multiple sections of linear distances) from the film of the full-covering surface and the bonding area of the bare surface of the beard or the half-covering surface, namely the creepage distance from the full-covering surface to the shell surface from the bare surface of the different-surface beard or the half-covering surface, and needs to be more than or equal to 4mm.
(V) the length and width dimensions are not significantly increased so as not to affect future battery module groups;
and sixthly, no exposure (except for specific exposure), gum opening, bubbles, wrinkles, corners, upwarp, scratches and dirt.
Disclosure of Invention
Aiming at the technical problems, the invention provides the U-shaped coating method of the square-shell battery, which has a simple process and meets the coating requirements in the background technology.
The invention adopts a long insulating film belt to be cut into insulating film belt sections (hereinafter collectively called insulating films) in the film coating process to coat the insulating film belt sections on the shell surface of a bare square-shell battery, and the operation procedures and the process flow of the U-shaped film coating method of the square-shell battery comprise the following steps:
sticking the bottom surface: the battery is firstly attached to the insulating film belt with the left large surface facing upwards and the bottom surface facing forwards and crossing with the bottom surface in the length direction, so that the head of the insulating film belt adhered to the bottom surface extends out of the bottom surface by a first length L in the direction of the left large surface or the right large surface m1 So that the insulating film tapes adhered to the bottom surface are extended by a first width W from the front and rear sides, respectively m1 ；
Pasting the left and right large faces: then the head and the tail of the insulating film are respectively paved to the left large surface and the right large surface to ensure that the head of the insulating film is positioned on the left large surface or the right large surface according to the second length L m2 Extends out of the top surface;
cutting the belt: cutting off the tail of the insulating film strip to ensure that the length of the tail of the insulating film strip extending out of the top surface on the right large surface or the left large surface is also the second length L m2 ；
Trimming: cutting the four insulating films extending out of the front side surface and the rear side surface on the left large surface and the right large surface from the edges of the insulating films to the corresponding front side surface and the corresponding rear side surface at preset positions, and extending to a preset distance from the corresponding front side surface and the corresponding rear side surface to form four cuts, so that the insulating films extending out of the front side surface and the rear side surface on the left large surface and the right large surface become cut insulating films, and the insulating films extending out of the front side surface and the rear side surface on the bottom surface are reserved to become non-cut insulating films; or the two insulating films extending out of the front side surface and the rear side surface on the bottom surface respectively extend to the corresponding front side surface and the rear side surface from the edge of the insulating film at preset positions and are cut off, and the insulating films extend to a preset distance from the corresponding front side surface and the corresponding rear side surface to form four cut openings, so that the insulating films extending out of the front side surface and the rear side surface on the bottom surface become cut-surface insulating films, and the insulating films extending out of the front side surface and the rear side surface on the left large surface and the right large surface are reserved to become non-cut-surface insulating films;
folding and pasting a non-shearing surface: folding and pasting two non-shearing face insulating films extending out of a front side face and a rear side face on a bottom face onto the corresponding front side face and the corresponding rear side face respectively to form two bottom layer insulating films, enabling edge parts of the shearing mouths of the non-shearing face insulating films extending out of the front side face and the rear side face on the bottom face, which are originally connected with two edges of the non-shearing face insulating films extending out of the front side face and the rear side face on a left large face and a right large face, to be inclined and folded and pasted onto the shearing face insulating films extending out of the front side face and the rear side face on the left large face and the right large face, forming a coincidence area of the four insulating films with the adhesive faces of the insulating films for pasting the adhesive faces of the insulating films, enabling the initial end of the coincidence area, which is positioned outside the extension line of the shearing mouths, to form a right-angled triangle, and the hypotenuse of the right-angled triangle is a folding edge;
or folding and pasting the non-shearing face insulating films on the left large face and the right large face, which respectively extend out of the front side face and the rear side face, onto the front side face and the rear side face to form bottom layer insulating films, and enabling edge parts, originally connected with the shearing mouth of the non-shearing face insulating films extending out of the front side face and the rear side face, of the non-shearing face insulating films extending out of the front side face and the rear side face on the left large face and the right large face to be obliquely folded and pasted onto the shearing face insulating films extending out of the front side face and the rear side face on the bottom face, so as to form four insulating films and paste the overlapping areas of the insulating film adhesive faces with the insulating film adhesive faces, so that the initial ends, located outside the shearing mouth extension lines, of the overlapping areas form a right-angled triangle, the hypotenuses of the right-angled triangle are folding edges, and the bottom layer insulating films on the front side face and the rear side face are pasted onto the front side face and the rear side face and are overlapped with each other to form a first overlapping area which completely covers the front side face and the rear side face;
folding and pasting a shearing face: folding and attaching the two sheared surface insulating films extending from the front side surface and the rear side surface on the left large surface and the right large surface respectively to the front side surface and the rear side surface together with the overlapped area, and folding and attaching the two non-sheared surface insulating films extending from the front side surface and the rear side surface on the bottom surface to the two bottom layer insulating films formed on the corresponding front side surface and the corresponding rear side surface respectively to form a surface layer insulating film, wherein the two surface layer insulating films are attached to the front side surface, the rear side surface and the bottom layer insulating film and are overlapped with each other to form a second overlapped area which completely covers the front side surface and the rear side surface; wherein the overlapping region 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 on the surface insulating film is exposed on the bottom insulating film;
or respectively folding and pasting the two shearing face insulating films extending out of the front side face and the rear side face on the bottom face and the overlapping area on the corresponding front side face and the corresponding rear side face, respectively folding and pasting the two non-shearing face insulating films extending out of the front side face and the rear side face on the left large face and the right large face on the corresponding front side face and the corresponding bottom layer insulating films formed on the rear side face to form two surface layer insulating films, wherein the overlapping area of the surface layer insulating films is only folded and covered on the bottom layer insulating films and is not pasted on the bottom layer insulating films, and the folded edges on the surface layer insulating films are exposed on the bottom layer insulating films;
folding and pasting the top surface: folding the insulating films extending out of the top surfaces on the left large surface, the right large surface, the front side surface and the rear side surface to be attached to the top surfaces;
pasting a top sheet: and attaching the top insulating sheet to the folded insulating film on the top surface.
Furthermore, during trimming, the vertical distance from the trimmed edge of each trimmed opening to the adjacent non-trimmed insulating film is equal to the distance from the bottom point of the trimmed opening to the corresponding front side surface and rear side surface, and is a first distance A, when the width W of the battery is larger than or equal to 8mm, the four parts of the overlapped area, which are positioned outside the extension line of the trimmed opening, are properly attached to form four isosceles right-angled triangles with the right-angled side length of A, wherein A is larger than or equal to 4mm, and the shortest distances J from the bottom points of the four trimmed openings on the surface layer insulating films on the front side surface and the rear side surface of the battery after being folded and attached to the trimmed surfaces to the shell surfaces of the left large surface, the right large surface and the bottom surface of the battery respectively meet the condition that J is larger than or equal to 4mm.
Further, when the cell width W is more than or equal to 8mm, the insulating film strip extends out of the first width W of the front side surface and the rear side surface m1 Satisfies the condition that W is less than or equal to 2mm of 1/2W m1 W or less, and the distance D between two original edges of the insulation films which are respectively lapped with each other at two positions and adhered on the front side surface and the back side surface after the cutting surface is folded and adhered 1 Satisfy D 1 ≥4mm。
Further, 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, after the left and right large surfaces are attached, the tape head of the insulating film extends out of the second length L of the top surface on the left large surface or the right large surface m2 And the second length L of the insulating film strip tail extending out of the top surface on the right large surface or the left large surface after the strip cutting m2 Satisfy L of 4mm or less m2 And B is less than or equal to B, after the top surface is folded and pasted, the distance C from any point on the left large surface, 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 satisfies that C is more than or equal to 4mm.
Furthermore, the length of the battery is L, and when the width W of the battery is more than or equal to 8mm, the bandwidth W of the insulating film m ＝L+2W m1 Satisfy L + W +4mm ≤ W m ≤L+2W。
Further, the height of the battery is H, 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 tape head of the insulating film extends out of the first length L of the bottom surface m1＝ H+L m2 And satisfy H +4mm ≤ L m1 H + B, after cutting the band, the length of the insulating film band required by enveloping a batteryL m Satisfying 2H + W +8mm < L m ≤2H+W+2B。
The U-shaped coating method for the square-shell battery has the beneficial effects that:
when coating the film, firstly pasting the bottom surface and the left and right large surfaces of the battery, cutting the insulating film tape, trimming the insulating film extending on the bottom surface or the left and right large surfaces outside the front and back side surfaces of the battery, folding and pasting the insulating film on the bottom surface or the left and right large surfaces of the battery according to the trimming position, folding and pasting the top surface of the battery, and finally pasting the top plate; the edge cutting treatment can ensure that the problem that the folded and pasted surface is warped can not occur after the folding and pasting. The top pasting sheet can press the insulating film with the top surface folded and pasted, so that the top surface trimming is avoided, and the operation flow is simplified. The tape is used in the case of using an insulating film tape. The coating method for the U-shaped coating of the square-shell battery 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-can battery;
FIG. 2 is a process flow chart of the U-shaped coating method of the battery of the invention;
FIG. 3 is a process flow chart of a U-shaped battery enveloping method according to a first embodiment of the present invention;
FIG. 4 is a schematic view of the bottom and left and right surfaces of a U-shaped battery enveloping method in accordance with a first embodiment of the present invention;
fig. 5 is a schematic diagram of a left and right large surfaces of a cut edge of a U-shaped battery enveloping method according to a first embodiment of the invention;
fig. 6 is a schematic view of a folded bottom surface of a U-shaped battery enveloping method according to a first embodiment of the invention;
fig. 7 is a schematic view of a folded left and right large surfaces of a U-shaped enveloping method for a battery according to a first embodiment of the invention;
FIG. 8 is a schematic top view of a U-shaped battery enveloping method according to a first embodiment of the present invention;
fig. 9 is a schematic view of a battery U-shape coating method according to a first embodiment of the present invention;
FIG. 10 is a process flow chart of a U-shaped battery coating method according to a second embodiment of the present invention;
FIG. 11 is a schematic bottom view of a cut edge of a U-shaped enveloping method for batteries according to a second embodiment of the present invention;
FIG. 12 is a schematic view of the folded left and right surfaces of a U-shaped battery enveloping method according to a second embodiment of the present invention;
fig. 13 is a schematic view of a folded bottom surface of a U-shaped battery enveloping method according to a second embodiment of the invention.
Description of reference numerals:
100. a battery; 11. a top surface; 12. the left major surface; 13. a rear side; 14. a positive post; 15. a liquid injection port; 16. an explosion-proof window; 17. two-dimensional codes; 18. a negative pole post; 20. a first lap joint zone; 21. cutting the opening; 22. a coincidence region; 23. a second lap zone; 24. folding the edges; 25. the lap is exposed laterally.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "front", "rear", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, 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 expressly stated or limited otherwise, the terms "mounted," "connected," and "coupled" are to be construed broadly and encompass, for example, both fixed and removable coupling as well as integral coupling; the two components can be directly connected with each other or indirectly connected with each other through an intermediate medium, and the two components can be communicated with each other. Specific meanings of the terms in the present invention will be understood as specific cases to those of ordinary skill in the art.
The invention provides a U-shaped coating method for a square-shell battery, which is characterized in that a long insulating film strip is cut into insulating film strip sections (hereinafter, collectively referred to as insulating films) in the coating process to coat six shell surfaces of a bare square-shell battery 100.
Referring to fig. 1 to 13, the operation steps and process flow of the U-shaped coating method for the square-casing battery include:
s10, sticking the bottom surface: the battery 100 is first attached to the insulating film tape with the left large side 12 facing upward and horizontal and the bottom side facing forward and intersecting the bottom side in the longitudinal direction, so that the insulating film tape attached to the bottom side extends to the left large side 12 or the right large side (not shown) by a first length L from the bottom side (not shown) m1 So that the insulating film tape adhered to the bottom surface (not shown) is extended by a first width W of the front side surface (not shown) and the rear side surface 13, respectively m1 ；
S20, pasting the left and right large faces: then, the tape head and the tape tail of the insulating film are respectively paved on the left large surface 12 and the right large surface (not marked) to ensure that the tape head of the insulating film is positioned on the left large surface 12 or the right large surface (not marked) according to the second length L m2 Extends out of the top surface 11;
s30, cutting the belt: cutting off the tail of the insulating film strip to make the length of the tail of the insulating film strip extending out of the top surface 11 on the right large surface (not shown) or the left large surface 12 extending out of the top surface 11 also be a second length L m2 ；
S40, trimming: cutting off the four insulating films extending out of the front side surface (not marked) and the back side surface 13 on the left large surface 12 and the right large surface (not marked) from the edge of the insulating film to the corresponding front side surface (not marked) and the corresponding back side surface 13 at preset positions, and extending to a preset distance from the corresponding front side surface (not marked) and the corresponding back side surface 13 to form four cut openings 21, so that the insulating films extending out of the front side surface (not marked) and the back side surface 13 on the left large surface 12 and the right large surface (not marked) become cut-off insulating films, and the insulating films extending out of the front side surface (not marked) and the back side surface 13 on the reserved bottom surface (not marked) become non-cut-off insulating films; or cutting off the two insulation films extending out of the front side surface (not marked) and the back side surface 13 on the bottom surface (not marked) from the edges of the insulation films to the corresponding front side surface (not marked) and back side surface 13 at preset positions respectively, and extending to a preset distance from the corresponding front side surface (not marked) and back side surface 13 to form four cuts 21, so that the insulation films extending out of the front side surface (not marked) and the back side surface 13 on the bottom surface (not marked) become cut insulation films, and the insulation films extending out of the front side surface (not marked) and the back side surface 13 on the left large surface 12 and the right large surface (not marked) are reserved to become non-cut insulation films;
the vertical distance from the four cutouts 21 to the non-clipped insulation film extending from the adjacent bottom surface (not shown) or from the left large surface 12 and the right large surface (not shown) is equal to the distance from the cutouts 21 to the front side surface (not shown) and the rear side surface 13, and is a first distance a;
s50, folding and pasting a non-shearing surface: folding and pasting two non-shearing face insulation films extending out of a front side face (not marked) and a rear side face 13 on a bottom face (not marked) to the corresponding front side face (not marked) and the rear side face 13 to form two bottom layer insulation films, and enabling edge parts of shearing mouths 21 of the two shearing face insulation films extending out of the front side face (not marked) and the rear side face 13 on the bottom face (not marked) to be connected with two sides of the non-shearing face insulation films extending out of the front side face (not marked) and the rear side face 13 on a left large face 12 and a right large face (not marked) to be toppled and pasted on the shearing face insulation films extending out of the front side face (not marked) and the rear side face 13 on the left large face 12 and the right large face (not marked), forming coincidence areas 22 of the four insulation films for pasting the insulation films with the insulation films and the insulation films, enabling the starting ends of the coincidence areas 22 outside extension lines of the shearing mouths 21 to form a right-angled triangle, and the hypotenuse of the right-angled triangle is a folding edge 24;
or folding and pasting two non-clipping insulation films respectively extending out of the front side surface (not marked) and the rear side surface 13 on the left large surface 12 and the right large surface (not marked) onto the front side surface (not marked) and the rear side surface 13 to form a bottom layer insulation film, enabling the edge parts of clipping openings 21 of the clipping insulation films extending out of the front side surface (not marked) and the rear side surface 13 on the left large surface 12 and the right large surface (not marked) to be connected with the two sides of the non-clipping insulation films extending out of the front side surface (not marked) and the rear side surface 13 on the bottom surface (not marked), and falling and folding and pasting the edge parts of the clipping insulation films extending out of the front side surface (not marked) and the rear side surface 13 on the bottom surface (not marked), forming four insulation films to paste the overlapping regions 22 of the insulation films with the insulation films adhesive surfaces, enabling the starting ends of the overlapping regions, which are positioned outside the extension lines of the clipping openings 21, to form a right-angled triangle, and the hypotenuse of the right-angled triangle is a folding edge; two bottom insulating films are respectively adhered on the front side surface (not shown) and the back side surface 13 and are overlapped with each other to form a first overlapping area 20 which completely covers the front side surface (not shown) and the back side surface 13;
the parts of the four overlapping areas 22 outside the extension lines of the scissor opening 21 are properly attached to form four isosceles right triangles with the length of the right angle being the distance A.
S60, folding and pasting a shearing surface: then, folding and attaching two cut-surface insulating films respectively extending from the front side surface (not marked) and the rear side surface 13 on the left large surface 12 and the right large surface (not marked) to the front side surface and the rear side surface together with the overlapping regions, and folding and attaching the two cut-surface insulating films to two bottom layer insulating films to form a surface layer insulating film, wherein the two surface layer insulating films are adhered to the corresponding front side surface (not marked) and the corresponding rear side surface 13 and the corresponding bottom layer insulating films and are overlapped with each other to form a second overlapping region 23 which completely covers the front side surface (not marked) and the rear side surface 13; wherein, the overlapping region 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 on the surface insulating film is exposed on the bottom insulating film;
or two non-shearing insulating films extending from the front side surface (not marked) and the rear side surface 13 on the bottom surface (not marked) and the overlapping area 22 are respectively folded and attached to the corresponding front side surface (not marked) and the corresponding rear side surface 13 and extending from the left large surface 12 and the right large surface (not marked) to the front side surface (not marked) and the rear side surface 13 respectively to form two bottom layer insulating films on the corresponding front side surface (not marked) and the corresponding rear side surface 13, so as to form two surface layer insulating films, wherein the overlapping area 22 of the surface layer insulating films is only folded and covered on the bottom layer insulating films and is not adhered to the bottom layer insulating films, and the folded edge 24 on the surface layer insulating films is exposed on the bottom layer insulating films;
it should be noted that the folding edge 24 is preferably short and is not preferably long as the hypotenuse of the isosceles right triangle, and the first distance a is preferably small and is not preferably large as the right-angle side of the isosceles right triangle.
The non-cutting surface S50 is firstly folded and pasted, the edge part of the cutting opening 21 which originally belongs to the cutting surface insulating film is overturned and folded on the cutting surface insulating film to form a superposition area 22, and then the cutting surface S60 is folded and pasted, so that the cutting surface insulating film is folded and pasted on the front side surface (not marked) and the bottom layer insulating film on the rear side surface 13, and simultaneously, the superposition areas 22 except the superposition area 22 at the isosceles right triangle part are tucked.
The non-trimming surface insulating film extending from the bottom surface (not shown) to the front side surface (not shown) and the rear side surface 13 is first folded and attached to the front side surface (not shown) and the rear side surface 13 to form a small-section bottom insulating film, the bottom insulating film partially covers the front side surface (not shown) and the rear side surface 13, or the non-trimming surface insulating film extending from the front side surface (not shown) to the right side surface (not shown) and the rear side surface 13 is first folded and attached to the front side surface (not shown) and the rear side surface 13 to form a first overlapping region 20 completely covering the front side surface (not shown) and the rear side surface 13, the trimming surface insulating film extending from the front side surface (not shown) to the left side surface 12 and the right side surface (not shown) to the rear side surface 13 is then attached to the front side surface (not shown) and the rear side surface 13, the non-trimming surface insulating film extending from the front side surface (not shown) and the rear side surface 13 to the front side surface (not shown) and the rear side surface 13, the non-trimming surface insulating film extending from the bottom surface (not shown) to the front side surface (not shown) and the rear side surface 13 to form a small-section insulating film (not shown) or the front side surface (not shown) and the rear surface (not shown) to form a small-section insulating film (not shown) and the rear surface 13), and the front side surface (not shown) and the non-section insulating film, and the non-section insulating film 13, the front side surface (not shown) and the non-section insulating film extending from the front side surface (not shown) and the rear surface (not shown) to form a second overlapping region 13, and the rear surface (not shown) and the rear surface, the front side surface (not shown) and the rear surface, the rear surface (not shown cover the front side surface of the rear surface of the housing The surface insulating film is folded and pasted on the front side surface (not shown) and the whole surface bottom layer insulating film on the back side surface 13 to form a small section of surface layer insulating film; the whole surface layer insulating film covers a small section of bottom layer insulating film or a small section of surface layer insulating film covers the whole surface layer insulating film, and the whole surface of the front side surface (not marked) and the back side surface 13 is insulated and coated.
S70, folding and pasting the top surface 11: folding the insulating films extending out of the top surface 11 on the left large surface 12, the right large surface (not shown), the front side surface (not shown) and the rear side surface 13 onto the top surface 11;
s80, attaching a top sheet: the top insulating sheet is attached to the folded insulating film on the top surface 11.
Specifically, when the width W of the battery 100 is greater than or equal to 8mm during trimming S40, the first distance a is greater than or equal to 4mm, so that the creepage distances J from the base points of the four trims 21 on the surface insulating films on the front side (not shown) and the rear side 13 of the battery 100 after being folded and attached to the trimming surface S60, and from the opening points of the four folded edges 24 of the four isosceles right triangle hypotenuses to the bottom surface (not shown) of the battery 100 or the shell surfaces of the left large surface 12 and the right large surface (not shown) become the shortest creepage distances J from the edges of the trims 21 and the folded edges 24 exposed on the surface insulating films on the front side (not shown) and the rear side 13 of the packaged battery 100 to the shell surfaces of the left large surface 12, the right large surface (not shown) and the bottom surface (not shown), and J is greater than or equal to 4mm (minimum safe creepage distance), thereby meeting the packaging requirements.
Specifically, when the width W of the battery 100 is not less than 8mm, the insulating film tape extends out of the first width W of the front side surface (not shown) and the rear side surface 13 m1 Satisfies the condition that W is less than or equal to 2mm of 1/2W m1 W, folding and pasting the cut surface S60, and then pasting the distance D between two original edges of the surface layer insulating film which are mutually lapped and respectively coated on the front side surface (not marked) and the back side surface 13 1 I.e. the creepage distance from the original edge of an insulating film (abbreviated as side exposure lap edge 25) still exposed on two underlying insulating films on the front side (not shown) and the back side 13 of the battery 100 to the shell surface of the front side (not shown) and the back side 13 of the battery 100, satisfies D 1 Not less than 4mm (minimum safe creepage distance) and meets the requirement of coating.
Specifically, when the width W of the battery 100 is greater than or equal to 8mm and the minimum width B of the edge plane of the top surface is greater than or equal to 4mm, the tape head of the insulating film extends out of the second length L of the top surface 11 on the left large surface 12 or the right large surface (not labeled) after the left and right large surfaces S20 are attached m2 And a second length L of the tape tail extending from the top surface 11 of the insulating film on the right large surface (not shown) or on the left large surface 12 after cutting the tape S30 to the top surface 11 m2 Satisfy L of 4mm or less m2 Less than or equal to B, and after the top surface S70 is folded, the creepage distance C from any point on the left large surface 12, the right large surface (not marked), the front side surface (not marked) and the rear side surface 13 of the battery 100 to the shell surface of the top surface 11 of the battery 100 is fullThe foot C is more than or equal to 4mm (minimum safe creepage distance), and meets the coating requirement.
Specifically, the length of the battery 100 is L, and when the width W of the battery is more than or equal to 8mm, the width W of the insulating film m ＝L+2W m1 Satisfy L + W +4mm ≤ W m ≤L+2W。
Specifically, the height of the cell 100 is H, and when the cell width W is greater than or equal to 8mm and the minimum width B of the top surface along the plane is greater than or equal to 4mm, the first length L of the insulating film strip head extending out of the bottom surface m1＝ H+L m2 And satisfy H +4mm ≤ L m1 H + B, length L of insulating film required for enveloping a battery 100 after cutting the tape S30 m ＝L m1 +W+H+L m2 ＝2H+W+2L m2 Meet the condition that the width of W + is less than or equal to L m ≤2H+W+2B。
To save the insulating film, the width W of the insulating film can be set m Narrower, but the insulating films extending from the front side (not shown) and the rear side 13 on the left and right large faces 12 and (not shown) cannot overlap each other on the front side (not shown) and the rear side 13, and the front side (not shown) and the rear side 13 can only be half-clad.
And the edge shearing processing S40 can ensure that the folded surface does not warp after being folded. The top pasting sheet can press the insulating film with the top surface 11 folded and pasted, so that the edge shearing of the top surface 11 is avoided, and the operation flow is simplified. The dicing tape S30 is used in the case of using an insulating film tape. The U-shaped coating method for the square-shell battery has the advantages of wide coating application range, good coating quality and high coating efficiency.
Example one
Referring further to fig. 1 and 3 to 9, the insulating film used is a long insulating film strip fed by an insulating film strip pulling device, and in terms of the posture that the top surface 11 of the battery 100 faces upwards and the liquid injection port 15 faces forwards, the U-shaped enveloping method of the square-shell battery of the invention comprises:
s10, sticking the bottom surface: referring to fig. 4, the battery 100 is first bonded to the insulating film tape with the left large side 12 facing upward and horizontal and the bottom side (not labeled) facing forward and crossing the bottom side in the longitudinal direction, such that the head of the insulating film tape adhered to the bottom side (not labeled) extends out of the bottom side (not labeled) in the direction of the left large side 12 by a first length L m1 Extending the insulating film tape adhered to the bottom surface (not shown)A first width W from the front side (not shown) and the back side 13 m1 ；
S20, pasting the left and right large faces: referring to fig. 4, the tape head and the tape tail of the insulating film are respectively applied to the left large surface 12 and the right large surface (not labeled) so that the tape head of the insulating film is positioned on the left large surface 12 by a second length L m2 Extends out of the top surface 11;
s30, cutting the belt: referring to fig. 4, the tail of the insulating film is cut such that the tail of the insulating film extending from the top surface 11 on the right large surface (not labeled) extends out of the top surface 11 by a second length L m2 ；
S40A, trimming left and right large faces: referring to fig. 5, cutting off the four insulating films extending from the edges of the insulating films to the corresponding front side surface (not shown) and back side surface 13 at predetermined positions on the left large surface 12 and the right large surface (not shown), and extending to a predetermined distance from the corresponding front side surface (not shown) and back side surface to form four cut-outs 21, so that the insulating films extending from the front side surface and back side surface 13 on the left large surface 12 and the right large surface become cut-off insulating films, and the insulating films extending from the front side surface (not shown) and back side surface 13 on the bottom surface are left as non-cut-off insulating films;
the vertical distance from the four cutouts 21 to the non-cut insulating film extending from the adjacent bottom surface (not shown) is equal to the distance from the front side surface (not shown) and the rear side surface 13 to which the cutouts 21 extend, and is a first distance a;
S50A, folding and pasting the bottom surface: referring to fig. 6, first, two non-clipping insulation films extending from the front side surface (not shown) and the back side surface 13 on the bottom surface (not shown) are folded and attached to the front side surface (not shown) and the back side surface 13 to form two small sections of bottom insulation films, and the edge portions of the clipping openings 21 of the two clipping insulation films extending from the front side surface (not shown) and the back side surface 13 on the bottom surface (not shown) are connected to the two sides of the non-clipping insulation films extending from the front side surface (not shown) and the back side surface 13, which originally belong to the clipping insulation films extending from the front side surface (not shown) and the back side surface 12 on the left large surface and the right large surface (not shown), and are folded and attached to the clipping insulation films extending from the front side surface (not shown) and the back side surface 13 on the right large surface (not shown), so as to form four insulation films to stick the overlapping regions 22 of the insulation films with the adhesive surfaces of the insulation films, and the starting ends of the overlapping regions 22 located outside the clipping openings 21 form a right triangle, and the hypotenuse of the right triangle is a folded edge 24; two small sections of bottom layer insulating films are adhered to the near-bottom surface (not marked) sections of the front side surface (not marked) and the back side surface 13;
referring to fig. 6, the four overlapping areas 22 outside the extension line of the cutting opening 21 are properly attached to form four isosceles right triangles with the length of the right angle being the distance a.
S60A, folding and pasting the left and right large faces: referring to fig. 7, the cut-out insulating films extending from the front side (not shown) and the back side 13 on the left large side 12 and the right large side (not shown) are folded and attached to the corresponding front side (not shown) and the back side 13 together with the overlapping regions 22, and are folded and attached to the two bottom insulating films to form the surface insulating films, which are attached to the corresponding front side (not shown), the back side 13 and the bottom insulating films and are overlapped with each other to form the second overlapping region 23 that covers the front side (not shown) and the back side 13; wherein, the overlapping region 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 folding edge 24 on the surface insulating film is exposed on the bottom insulating film;
it should be noted that the folding edge 24 is preferably short and is not preferably long as the hypotenuse of the isosceles right triangle, and the first distance a is preferably small and is not preferably large as the right-angle side of the isosceles right triangle.
Referring to fig. 6 and 7, the bottom surface S50A is folded to form the overlapping area 22 on the two cut-out insulating films extending from the front side (not shown) and the rear side 13, which are folded over the left and right large surfaces (not shown) to form the overlapping area 22, and then the left and right large surfaces S60A are folded to fold the two cut-out insulating films to the bottom insulating films on the front side (not shown) and the rear side 13, and simultaneously the overlapping area 22 except the overlapping area 22 of the isosceles right triangle is hidden.
Referring to fig. 6 and 7, the non-cut insulating film extending from the front side (not shown) and the rear side 13 on the bottom surface is first folded and attached to the front side (not shown) and the rear side 13 to form a small section of bottom insulating film, the bottom insulating film partially covers the front side (not shown) and the rear side 13, the left and right major surfaces are then folded and attached to S60A, the non-cut insulating film extending from the front side (not shown) and the rear side 13 on the left and right major surfaces (not shown) is folded and attached to the small section of bottom insulating film extending from the front side (not shown) and the rear side 13 on the bottom surface (not shown) and the rear side 13 on the front side (not shown) and the rear side 13 to form a whole section of insulating film, the top insulating film forms a second overlapping region 23, the front side (not shown) and the rear side 13 are fully covered, the whole section of insulating film overlaps the front side (not shown) and the rear side 13 to form a small section of insulating film, and the whole section of the front side (not shown) and the rear side 13 is overlapped and the whole section of the insulating film covers the front side and the rear side (not shown).
Further, the left and right large faces S60A are folded and attached after the bottom face S50A is folded, see fig. 6 and 7, because the side lengths of the left and right large faces (not labeled) are longer than the side lengths of the bottom face (not labeled) on the front side face (not labeled) and the rear side face 13, so that the surface insulating film formed on the front side face (not labeled) and the rear side face 13 on the relatively wide left and right large faces (not labeled) of the rear folded and extended front side faces (not labeled) and rear side faces 13 covers the surface insulating film formed on the front side face (not labeled) and the bottom insulating film formed on the relatively narrow bottom face (not labeled) of the front folded and rear side faces 13 on the non-shear-surface insulating film folded on the front side face (not labeled) and rear side faces 13, in other words, the wide surface insulating film extended front side face (not labeled) and rear side face 13 on the left and right large faces (not labeled) of the long side faces covers the long side face insulating film on the long bottom face (not labeled and the short side face (not labeled) of the rear side face insulating film, and the short side face (not labeled) can be easily covered by the short side insulating film (labeled and the short side adhesive, and the short side adhesive can be avoided.
S70, folding and pasting the top surface 11: with further reference to fig. 8, the insulating film extending beyond the top surface 11 on the left and right major surfaces 12 and 13, on the front side surface and the back side surface (not shown), is folded over the top surface 11; because the length of the insulating film extending out of the top surface 11 is very short, the insulating film can be directly folded and pasted without trimming.
S80, attaching a top sheet: with further reference to fig. 9, a top insulating sheet is applied over the folded insulating film on the top surface 11. Be equipped with positive post 14 on the top surface 11, annotate liquid mouth 15, explosion-proof window 16, two-dimensional code 17 and negative pole post 18, the length and width size of top insulating piece is unanimous with top surface 11, top insulating piece is at corresponding positive post 14, annotate liquid mouth 15, explosion-proof window 16, the position of two-dimensional code 17 and negative pole post 18 is equipped with the fretwork, both can guarantee the electrical isolation effect of top insulating piece, can not influence positive post 14 on the top surface 11 again, annotate liquid mouth 15, explosion-proof window 16, the use of two-dimensional code 17 and negative pole post 18.
Specifically, referring to fig. 5, when the left and right large faces S40A are trimmed, when the width W of the battery 100 is greater than or equal to 8mm, the first distance a is greater than or equal to 4mm, referring to fig. 7, the creepage distance J from the bottom points of the four cutouts 21 on the surface insulating film on the front side (not shown) and the rear side 13 of the battery 100 after being folded and attached to the left and right large faces S60A, and the opening points of the four folded edges 24, which are also the hypotenuses of the four isosceles right triangles, to the case surface of the left large face 12 and the right large face (not shown) of the battery 100 becomes the shortest creepage distance J from the edge of the cutout 21 and the folded edge 24 exposed from the surface insulating film on the front side (not shown) and the rear side 13 after being folded and attached to the left and right large faces S60A to the case surface of the left and right large faces (not shown) of the battery 100, and J is greater than or equal to 4mm (minimum creepage distance), which meets the envelope requirement.
Specifically, referring to FIGS. 4 and 7, when the width W of the battery 100 is not less than 8mm, the insulating film tape extends out of the first width W of the front side surface (not shown) and the rear side surface 13 m1 Meet the requirement that W is less than or equal to 2mm at 1/2W m1 W is less than or equal to W, and the distance D between two original edges of the insulation film which is respectively coated on the front side surface (not marked) and the back side surface 13 and is in lap joint with each other after the left and right large surfaces S60A are folded and pasted 1 From the original edge (abbreviated as side exposure lap 25) of an insulating film still exposed on the two underlying insulating films on the front side (not shown) and the back side 13 of the battery 100 to the battery 100, the creepage distance of the casing surfaces of the front side (not shown) and the rear side 13, satisfying D 1 Not less than 4mm (minimum safe creepage distance) and meets the requirement of coating.
Specifically, referring to FIG. 8, when the width W of the battery 100 is greater than or equal to 8mm and the minimum width B of the top edge plane is greater than or equal to 4mm, the tape head of the insulating film extends on the left large surface 12 by a second length L of the top surface 11 after the left and right large surfaces S20 are attached m2 And a second length L of the tape tail of the insulating film extending from the top surface 11 on the right large surface (not shown) after cutting the tape S30 to extend from the top surface 11 m2 Satisfy L of 4mm or less m2 And B, folding and pasting the top surface S70, wherein the creepage distance C from any point on the left large surface 12, the right large surface (not marked), the front side surface (not marked) 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 requirement that C is more than or equal to 4mm (minimum safe creepage distance), and the requirement of coating is met.
Specifically, referring to FIGS. 4 and 7, the length of the battery 100 is L, and the width W of the insulating film is greater than or equal to 8mm when the width W of the battery is greater than or equal to 8mm m ＝L+2W m1 Satisfy L + W +4mm ≤ W m ≤L+2W。
Specifically, referring to FIGS. 4 and 8, the height of the cell 100 is H, and when the cell width W is greater than or equal to 8mm and the minimum width B of the top surface along the plane is greater than or equal to 4mm, the head of the insulating film extends out of the first length L of the bottom surface m1＝ H+L m2 And satisfies H +4mm < L m1 H + B, length L of insulating film required for enveloping a battery 100 after cutting the tape S30 m ＝L m1 +W+H+L m2 ＝2H+W+2L m2 Meet the condition that the width of W + is less than or equal to L m ≤2H+W+2B。
To save the insulating film, the width W of the insulating film can be set m Narrower, but the insulating films extending from the front side (not shown) and the rear side 13 on the left and right large faces 12 and (not shown) cannot overlap each other on the front side (not shown) and the rear side 13, and the front side (not shown) and the rear side 13 can only be half-clad.
The edge shearing processing S40A can ensure that the problem that the folded surface is warped after being folded and pasted. The top pasting sheet can press the insulating film with the top surface 11 folded and pasted, so that the edge shearing of the top surface 11 is avoided, and the operation flow is simplified. The dicing tape S30 is used in the case of using an insulating film tape. The coating method for the U-shaped coating of the square-shell battery has the advantages of wide coating application range, good coating quality and high coating efficiency.
Example two
Referring to fig. 1 and fig. 10 to fig. 13, different from the first embodiment, the edge cutting and folding operation procedure and the process flow specifically include: the left and right large faces of the edge are cut, the front and rear side faces are folded and attached, and the left and right large faces are folded and attached, and other operation procedures and process flows are completely the same as those of the first embodiment. The distinguishing process flow is as follows:
S40B, trimming the bottom surface of the edge: referring to fig. 11, two insulating films extending from the front side surface (not shown) and the rear side surface 13 on the bottom surface (not shown) are respectively cut at predetermined positions from the edge of the insulating film to the corresponding front side surface (not shown) and rear side surface 13, and extend to a predetermined distance from the corresponding front side surface (not shown) and rear side surface 13 to form four cuts 21, so that the insulating films extending from the front side surface (not shown) and rear side surface 13 on the bottom surface (not shown) become cut insulating films, and the insulating films extending from the front side surface (not shown) and rear side surface 13 on the left large surface 12 and the right large surface (not shown) remain as non-cut insulating films;
referring to fig. 11, the vertical distance from the four cutouts 21 to the non-trimmed insulating films extending from the adjacent left and right large faces 12 and 13 is equal to the distance from the cutouts 21 to the front side face (not shown) and the rear side face 13, which is a first distance a;
S50B, folding and pasting the left and right large faces: referring to fig. 12, first, two non-clipping insulation films extending from the front side surface (not labeled) and the rear side surface 13 on the left large surface 12 and the right large surface (not labeled) are folded and adhered to the front side surface (not labeled) and the rear side surface 13 to form a whole bottom insulation film, the edge portions of the clipping openings 21, which originally belong to the clipping insulation films extending from the front side surface (not labeled) and the rear side surface 13 on the bottom surface (not labeled), connected to the two sides of the non-clipping insulation films extending from the front side surface (not labeled) and the rear side surface 13 on the left large surface 12 and the right large surface (not labeled) are folded and adhered to the clipping insulation films extending from the front side surface (not labeled) and the rear side surface 13 on the bottom surface (not labeled), to form four overlapping regions 22 where the insulation films are adhered to the adhesive surfaces of the insulation films, the starting ends of the overlapping regions 22 outside the clipping openings 21 form a right triangle, and the hypotenuse of the right triangle is a folding edge 24; two bottom insulating films are respectively adhered on the front side surface (not shown) and the back side surface 13 and are overlapped with each other to form a first overlapping area 20 which completely covers the front side surface (not shown) and the back side surface 13;
referring to fig. 11, the four overlapping areas 22 outside the extension lines of the scissors 21 are properly attached to form four isosceles right triangles with the length of the right angle being the distance a.
S60B, folding and pasting the bottom surface: referring to fig. 13, the cut-surface insulating film extending from the front side surface (not labeled) and the back side surface 13 on the bottom surface and the overlapping area 22 are respectively folded and attached to the corresponding front side surface (not labeled) and the corresponding non-cut-surface insulating film extending from the left large surface 12 and the right large surface (not labeled) on the back side surface 13 on the front side surface (not labeled) and the back side surface 13 on the corresponding back-surface insulating film formed on the front side surface (not labeled) and the back side surface 13, respectively, to form a top-surface insulating film, wherein the overlapping area 22 of the top-surface insulating film is only folded and covered on the bottom-surface insulating film and is not adhered to the bottom-surface insulating film, and the folded edge 24 of the top-surface insulating film is exposed on the bottom-surface insulating film;
referring to fig. 12 and 13, the left and right large surfaces S50B are folded and attached to the edge portions of the notches 21 of the two cut-surface insulating films extending from the front side surface (not shown) and the rear side surface 13, which originally belong to the bottom surface, and the edge portions are folded and folded to form the overlapping regions 22 on the two cut-surface insulating films extending from the front side surface (not shown) and the rear side surface 13, and then the bottom surface S60B is folded and attached to the bottom insulating film on the front side surface (not shown) and the rear side surface 13, so that the overlapping regions 22 except the overlapping regions 22 at the isosceles right-angled triangles are hidden.
Referring to fig. 12 and 13, the left and right large faces S50B are folded and attached first, the non-shear insulating films extending from the front side (not shown) and the rear side 13 on the left large face 12 and the right large face (not shown) are folded and attached to the front side (not shown) and the rear side 13 to form the whole bottom insulating films overlapping each other to form the first overlapping region 20 fully covering the front side (not shown) and the rear side 13, and then the bottom face S60B is folded and attached, the non-shear insulating films extending from the front side (not shown) and the rear side 13 on the bottom face (not shown) are folded and attached to the whole bottom insulating films on the front side (not shown) and the rear side 13 and extending from the front side (not shown) and the rear side 13 on the left large face 12 and the right large face (not shown) to form the small sections; the small-section surface layer insulating film covers the whole surface bottom layer insulating film, and the whole surface of the front side surface (not shown) and the back side surface 13 is coated with insulating materials.
Specifically, referring to fig. 11, when the width W of the battery 100 is greater than or equal to 8mm when the trimming S40B is cut, the first distance a is greater than or equal to 4mm, referring to fig. 13, so that the creepage distances J from the opening points of the four folded edges 24, which are the four isosceles right triangle hypotenuses, to the casing surface of the bottom surface (not labeled) of the battery 100 to the bottom points of the four cutouts 21 on the front side surface (not labeled) and the rear side surface 13 of the battery 100 after folding the trimming S60B, become the shortest creepage distances J from the sides of the cutouts 21 exposed on the front side surface (not labeled) and the folded edges 24 on the rear side surface 13 of the battery 100 after enveloping to the casing surface of the bottom surface (not labeled) of the battery 100, and J is greater than or equal to 4mm (minimum safe creepage distance), and meets the enveloping requirement.
The edge shearing processing S40A can ensure that the problem that the folded surface is warped after being folded and pasted. The top pasting sheet can press the insulating film with the top surface 11 folded and pasted, so that the edge shearing of the top surface 11 is avoided, and the operation flow is simplified. The dicing tape S30 is used in the case of using an insulating film tape. The coating method for the U-shaped coating of the square-shell battery has the advantages of wide coating application range, good coating quality and high coating efficiency.
The present invention is not limited to the above preferred embodiments, and any modifications, equivalents and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (6)

1. A U-shaped film coating method for a square-shell battery is characterized in that an insulating film is coated on the surface of a shell of a bare square-shell battery, and the U-shaped film coating method for the square-shell battery comprises the following steps:
sticking the bottom surface: the battery is firstly placed on the horizontal bottom surface with the left big surface facing upwardsThe insulating film tape crossed with the bottom surface in the length direction is attached in the forward direction, so that the head of the insulating film tape adhered on the bottom surface extends to the left large surface or the right large surface by a first length L of the bottom surface m1 So that the insulating film tapes adhered to the bottom surface are extended by a first width W from the front and rear sides, respectively m1 ；
Pasting the left and right large faces: then the head and the tail of the insulating film are respectively paved on the left large surface and the right large surface to ensure that the head of the insulating film is arranged on the left large surface or the right large surface according to the second length L m2 Extends out of the top surface;
cutting the belt: cutting off the tail of the insulating film strip to ensure that the length of the tail of the insulating film strip extending out of the top surface on the right large surface or the left large surface is also the second length L m2 ；
Trimming: the method comprises the steps that four insulating films extending out of the front side surface and the rear side surface on the left large surface and the right large surface respectively extend to the corresponding front side surface and the corresponding rear side surface from the edges of the insulating films at preset positions and are cut, and the insulating films extend to a preset distance from the corresponding front side surface and the corresponding rear side surface to form four cut openings, so that the insulating films extending out of the front side surface and the rear side surface on the left large surface and the right large surface become cut insulating films, and the insulating films extending out of the front side surface and the rear side surface on the reserved bottom surface become non-cut insulating films; or the two insulating films extending out of the front side surface and the rear side surface on the bottom surface respectively extend to the corresponding front side surface and the rear side surface from the edge of the insulating film at preset positions and extend to a preset distance from the corresponding front side surface and the corresponding rear side surface to form four shearing mouths, so that the insulating films extending out of the front side surface and the rear side surface on the bottom surface become shearing insulating films, and the insulating films extending out of the front side surface and the rear side surface on the left large surface and the right large surface are reserved to become non-shearing insulating films;
folding and pasting a non-shearing surface: firstly, folding and pasting two non-shearing face insulating films extending out of a front side face and a rear side face on a bottom face onto the corresponding front side face and the corresponding rear side face respectively to form two bottom layer insulating films, enabling edge parts of the shearing mouths of the non-shearing face insulating films extending out of the front side face and the rear side face on the bottom face, which are connected with two sides of the non-shearing face insulating films extending out of the front side face and the rear side face, originally belonging to two positions on a left large face and a right large face and extending out of the front side face and the rear side face to be inclined and pasted onto the shearing face insulating films extending out of the front side face and the rear side face, respectively forming two insulating films on the front side face and the rear side face to paste overlapping areas of the insulating film glue faces of the insulating films, enabling the starting ends of the overlapping areas, which are positioned outside the extension lines of the shearing mouths, to form a right-angled triangle, and the hypotenuse of the right-angled triangle is a folding edge;
or folding and pasting the non-shearing insulating films at two positions on the left large surface and the right large surface, which respectively extend out of the front side surface and the rear side surface, on the front side surface and the rear side surface to form a bottom layer insulating film, and enabling the edge parts of the cut openings of the non-shearing insulating films, which are connected with the two sides of the non-shearing insulating films extending out of the front side surface and the rear side surface on the left large surface and the right large surface and originally belong to the cut openings of the non-shearing insulating films extending out of the front side surface and the rear side surface on the bottom surface, to be toppled and pasted on the shearing insulating films extending out of the front side surface and the rear side surface on the bottom surface, so as to form a superposition area of the insulating film adhesive surfaces of the insulating films, and enabling the starting end of the superposition area, which is positioned outside the extension line of the cut openings, to form a right-angled triangle, the hypotenuse of the right-angled triangle, and the bottom layer insulating films at two positions on the front side surface and the rear side surface are pasted on the front side surface and the rear side surface and are mutually overlapped to form a first overlapping area which completely covers the front side surface and the rear side surface;
folding and pasting a shearing face: folding and attaching the two sheared surface insulating films extending from the front side surface and the rear side surface on the left large surface and the right large surface respectively to the front side surface and the rear side surface together with the overlapped area, and folding and attaching the two non-sheared surface insulating films extending from the front side surface and the rear side surface on the bottom surface to the two bottom layer insulating films formed on the corresponding front side surface and the corresponding rear side surface respectively to form a surface layer insulating film, wherein the two surface layer insulating films are attached to the front side surface, the rear side surface and the bottom layer insulating film and are overlapped with each other to form a second overlapped area which completely covers the front side surface and the rear side surface; wherein the overlapping region 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 on the surface insulating film is exposed on the bottom insulating film;
or folding and pasting the two sheared surface insulating films extending out of the front side surface and the rear side surface on the bottom surface and the overlapping area on the corresponding front side surface and the corresponding rear side surface respectively, and folding and pasting the two non-sheared surface insulating films extending out of the front side surface and the rear side surface on the left large surface and the right large surface on the corresponding front side surface and the corresponding rear side surface on the two bottom layer insulating films formed on the rear side surface respectively to form two surface layer insulating films, wherein the overlapping area of the surface layer insulating films is only folded and covered on the bottom layer insulating films and is not pasted on the bottom layer insulating films, and the folded edges on the surface layer insulating films are exposed on the bottom layer insulating films;
folding and pasting the top surface: folding the insulating films extending out of the top surfaces on the left large surface, the right large surface, the front side surface and the rear side surface to be attached to the top surfaces;
c, pasting a top sheet: and attaching the top insulating sheet to the folded insulating film on the top surface.
2. The U-shaped enveloping method for square-shell batteries according to claim 1, wherein the vertical distance from the edge of each of the notches to the adjacent non-sheared surface insulating film is equal to the distance from the bottom point of the notch to the corresponding front side surface and back side surface, namely a first distance A, when the battery width W is more than or equal to 8mm, the parts of the four overlapping areas outside the extension lines of the notches are properly attached to form four isosceles right triangles with the right angle side length A, wherein A is more than or equal to 4mm, and the shortest distances J from the bottom points of the four notches on the surface layer insulating films on the front side surface and the back side surface of the folded and sheared surface to the shell surface of the left large surface, the right large surface and the bottom surface of the battery respectively satisfy that J is more than or equal to 4mm.
3. The U-shaped coating method for the square-shell battery according to claim 2, wherein when the battery width W is not less than 8mm, the insulating film tape extends out of the first width W of the front side surface and the rear side surface m1 Satisfies the condition that W is less than or equal to 2mm of 1/2W m1 W or less, and the distance D between two original edges of the two mutually lapped insulation films adhered on the front side surface and the back side surface after the cutting surface is adhered 1 Satisfy D 1 ≥4mm。
4. The U-shaped coating method for square-casing batteries according to claim 3, wherein when the battery 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 tape head of the insulating film after being attached to the left and right large surfaces extends out of the second length L of the top surface on the left or right large surface m2 And the second length L of the tail of the insulating film strip extending out of the top surface on the right large surface or the left large surface after the strip cutting is extended out of the top surface m2 Satisfy L of 4mm or less m2 And B is less than or equal to B, after the top surface is folded and pasted, the distance C from any point on the left large surface, 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 satisfies that C is more than or equal to 4mm.
5. The U-shaped coating method for the square-shell battery according to claim 4, wherein the length of the battery is L, and the width W of the insulating film is W when the width W of the battery is more than or equal to 8mm m ＝L+2W m1 Satisfy L + W +4mm ≤ W m ≤L+2W。
6. The U-shaped coating method for the square-shell battery according to claim 5, wherein the height of the battery is H, and when the width W of the battery is not less than 8mm and the minimum width B of the edge plane of the top surface is not less than 4mm, the head of the insulating film extends out of the first length L of the bottom surface m1＝ H+L m2 And satisfies H +4mm < L m1 H + B, and the length L of the insulating film strip required by enveloping a battery after the strip is cut m Satisfying 2H + W +8mm < L m ≤2H+W+2B。
CN202211506263.0A 2022-11-28 2022-11-28 U-shaped film coating method for square-shell battery Pending CN115911498A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116365147A (en) * 2023-05-31 2023-06-30 深圳海辰储能控制技术有限公司 Energy storage battery, energy storage device and electric equipment

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116365147A (en) * 2023-05-31 2023-06-30 深圳海辰储能控制技术有限公司 Energy storage battery, energy storage device and electric equipment

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