CN117497923A - Square shell battery two-type film coating method - Google Patents
Square shell battery two-type film coating method Download PDFInfo
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- CN117497923A CN117497923A CN202311446892.3A CN202311446892A CN117497923A CN 117497923 A CN117497923 A CN 117497923A CN 202311446892 A CN202311446892 A CN 202311446892A CN 117497923 A CN117497923 A CN 117497923A
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- 238000000034 method Methods 0.000 title claims description 35
- 239000007888 film coating Substances 0.000 title abstract description 14
- 238000009501 film coating Methods 0.000 title abstract description 14
- 238000000576 coating method Methods 0.000 claims abstract description 43
- 239000011248 coating agent Substances 0.000 claims abstract description 28
- 241001061132 Eutaeniophorus sp. 033-Miya Species 0.000 claims description 6
- 238000009413 insulation Methods 0.000 claims description 6
- 102220475756 Probable ATP-dependent RNA helicase DDX6_S30A_mutation Human genes 0.000 claims description 5
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- 238000010586 diagram Methods 0.000 description 6
- 238000002347 injection Methods 0.000 description 4
- 239000007924 injection Substances 0.000 description 4
- 239000007788 liquid Substances 0.000 description 4
- 239000004698 Polyethylene Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000005538 encapsulation Methods 0.000 description 2
- 239000003292 glue Substances 0.000 description 2
- 230000017525 heat dissipation Effects 0.000 description 2
- 238000010030 laminating Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- -1 polyethylene terephthalate Polymers 0.000 description 2
- 229920000139 polyethylene terephthalate Polymers 0.000 description 2
- 239000005020 polyethylene terephthalate Substances 0.000 description 2
- 239000002033 PVDF binder Substances 0.000 description 1
- 229920003171 Poly (ethylene oxide) Polymers 0.000 description 1
- 239000004793 Polystyrene Substances 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229920003229 poly(methyl methacrylate) Polymers 0.000 description 1
- 229920005569 poly(vinylidene fluoride-co-hexafluoropropylene) Polymers 0.000 description 1
- 229920002239 polyacrylonitrile Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 229920005596 polymer binder Polymers 0.000 description 1
- 239000002491 polymer binding agent Substances 0.000 description 1
- 239000004926 polymethyl methacrylate Substances 0.000 description 1
- 229920002223 polystyrene Polymers 0.000 description 1
- 229920002689 polyvinyl acetate Polymers 0.000 description 1
- 239000011118 polyvinyl acetate Substances 0.000 description 1
- 229920002981 polyvinylidene fluoride Polymers 0.000 description 1
- 229920000036 polyvinylpyrrolidone Polymers 0.000 description 1
- 239000001267 polyvinylpyrrolidone Substances 0.000 description 1
- 235000013855 polyvinylpyrrolidone Nutrition 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000009966 trimming Methods 0.000 description 1
- 230000037303 wrinkles Effects 0.000 description 1
Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/116—Primary casings; Jackets or wrappings characterised by the material
- H01M50/124—Primary casings; Jackets or wrappings characterised by the material having a layered structure
- H01M50/1245—Primary casings; Jackets or wrappings characterised by the material having a layered structure characterised by the external coating on the casing
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/102—Primary casings; Jackets or wrappings characterised by their shape or physical structure
- H01M50/103—Primary casings; Jackets or wrappings characterised by their shape or physical structure prismatic or rectangular
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/14—Primary casings; Jackets or wrappings for protecting against damage caused by external factors
- H01M50/145—Primary casings; Jackets or wrappings for protecting against damage caused by external factors for protecting against corrosion
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/572—Means for preventing undesired use or discharge
- H01M50/584—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries
- H01M50/59—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries characterised by the protection means
- H01M50/593—Spacers; Insulating plates
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Sealing Battery Cases Or Jackets (AREA)
Abstract
The invention provides a square shell battery two-type coating method, wherein a battery is horizontally arranged on a left large surface and a right large surface, and two insulating film belts above the left large surface and below the right large surface of the battery are respectively paved and adhered on the left large surface and the right large surface; cutting two insulating film strips; then, the insulating film with the left large surface extending out of the bottom surface and the insulating film with the right large surface extending out of the bottom surface are folded and stuck on the bottom surface, so that the two insulating films are mutually overlapped on the bottom surface to form a U-shaped film coating initial form of the battery; or, folding and pasting the insulating film with the left large surface extending out of the front side surface and the insulating film with the right large surface extending out of the front side surface on the front side surface, and overlapping the insulating film and the insulating film on the front side surface; the insulating film with the left large surface extending out of the rear side surface and the insulating film with the right large surface extending out of the rear side surface are folded and stuck to the rear side surface, and are overlapped with each other on the rear side surface; forming the initial form of the battery loop-shaped coating. The two insulating film belts are used for paving the left large surface and the right large surface from top to bottom simultaneously, so that the coating time can be shortened, and the coating production efficiency is high.
Description
Technical Field
The invention belongs to the technical field of coating of square-shell batteries, and particularly relates to a square-shell battery secondary coating method.
Background
Referring to fig. 1, according to the state that the liquid injection port faces upward toward the front top surface, the battery 100 is divided into six shell surfaces, namely a top surface 11, a bottom surface 19, a left large surface 12, a right large surface 21, a front side surface 20 and a rear side surface 13, wherein 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 middle line of the top surface 11 of the conventional battery from front to back, 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 100, it is necessary to attach insulating films to six casing surfaces of the metal casing of the bare cell 100 so that the bare cell 100 becomes a coated battery to perform an electrical isolation (insulation) function and also perform an anti-corrosion and decorative function.
According to the film-covered form that the film-covered batteries are required to be insulated from each other when the battery module is assembled and the film-covered batteries are in contact with the module-covered shell, the positive pole column 14, the liquid injection port 15, the explosion-proof window 16, the two-dimensional code 17 and the negative pole column 18 are distributed on the top surface 11 of the battery, and are folded-over bare surfaces, the left large surface 12, the right large surface 21, the front side 20, the rear side 13 and the bottom surface 19 of the battery are all full-covered surfaces which are covered with insulating films and are not exposed by the shell surfaces, and if one or some surfaces of the left large surface 12, the right large surface 21, the front side 20, the rear side 13 and the bottom surface 19 of the battery are not required to be insulated when the battery module is assembled, but only one or some other surfaces are required to be insulated, the other surface or some other surfaces are required to be covered by the full-covered surfaces, and some surfaces can be half-covered surfaces which are only covered by edges of the surfaces and the middle parts of the surfaces are kept exposed by the shell surfaces, so that insulating film materials are saved.
Typical insulating film materials are made in two forms: the individual insulating films and the long insulating film tapes are generally stacked and supplied with the insulating films Zhang Diefang adhered to the same-size release film on the adhesive side, and the insulating film tapes are wound on a roll to form a double-layer film tape for supply. 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 herein where there is no need to distinguish between the insulating film sheet and the insulating film tape section, and the insulating film tape is cut into the insulating film tape section for encapsulation in the encapsulation process.
The insulating film is made of polyethylene terephthalate (also called PET), is generally 0.08-0.15 mm thick, and has excellent insulativity, high temperature resistance, flame retardance, heat dissipation and stretching rigidity; the back side 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) with thickness of 0.01-0.05 mm, can be solidified quickly when being irradiated by Ultraviolet (UV), and has excellent insulativity, high temperature resistance, flame retardance, heat dissipation and viscosity; 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.
On the basis that I have successfully developed a U-shaped film coating method and a loop-shaped film coating method which adopt one insulating film belt, we continue to develop a two-layer film coating method which adopts two insulating film belts to coat simultaneously so as to improve the coating efficiency of the square-shell battery.
Disclosure of Invention
The invention provides a square-shell battery secondary coating method which is simple in process, meets the coating requirement and is high in coating efficiency.
The invention adopts a long insulating film strip to cut into insulating film strip sections to be coated on the shell surface of a bare square shell battery in the coating process, and the working procedures and the technological process of the square shell battery secondary coating method comprise the following steps:
s10, sticking left and right large surfaces: firstly, the left large surface and the right large surface of the battery are horizontally arranged, and two insulating film belts obliquely arranged above the left large surface and below the right large surface of the battery are respectively paved and attached on the left large surface and the right large surface;
s20, cutting: cutting two insulating film strips at preset positions to obtain two insulating film strip sections;
S30A is folded and stuck on the bottom surface: the insulating film with the left large surface extending out of the bottom surface and the insulating film with the right large surface extending out of the bottom surface are folded and stuck on the bottom surface, so that the two insulating films are mutually overlapped on the bottom surface to form an overlapped area with the overlapped width D being more than or equal to 4mm, and an initial form of a U-shaped coating of the battery is formed;
or, S30B folds the front and back sides: the insulating film with the left large surface extending out of the front side surface and the insulating film with the right large surface extending out of the front side surface are folded and stuck on the front side surface, so that the two insulating films are mutually overlapped on the front side surface to form an overlapping area with overlapping width D being more than or equal to 4mm; the insulating film with the left large surface extending out of the rear side surface and the insulating film with the right large surface extending out of the rear side surface are folded and stuck on the rear side surface, so that the two insulating films are mutually overlapped on the rear side surface to form an overlapping area with the overlapping width D being more than or equal to 4mm, and an initial form of the battery wrapping film is formed.
Further, when the left and right large surfaces are attached to S10, the length direction of the two insulating film tape sections is consistent with the height direction of the battery, and the insulating films extending out of the front side surfaces on the left and right large surfaces are made to be a first width W m1 The insulating films extending out of the rear side surfaces on the left large surface and the right large surface are the same as the first width W m1 The method comprises the steps of carrying out a first treatment on the surface of the The S20 tape cutting cuts off the tape tail of the insulating film to enable the insulating film extending out of the top surface on the left large surface and the right large surface to be of a first length L m1 The insulation films extending from the bottom surfaces of the left large surface and the right large surface are made to be a second length L m2 ；
Specifically, a first length L m1 Second length L m2 Are all in the height direction of the battery, a first width W m1 In the length direction of the battery, the requirements of the width W of the battery are met, when W is more than or equal to 8mm, L is m1 ≥4mm，L m2 ≥W/2+2mm；W m1 ≥W/2+2mm。
Further, an insulating film length L required for pasting the left large surface or the right large surface of one cell m To meet the requirements of the height H and the width W of the battery, L m ＝H+L m1 +L m2 When W is more than or equal to 8mm, the method satisfies L m More than or equal to H+1/2W+6mm; width W of insulating film m To meet the requirement of the battery length L, W m ＝L+2W m1 Satisfy W m ≥L+W+4mm。
Further, when the left and right large surfaces are attached to the S10, the length direction of the two insulating film tape sections is consistent with the length direction of the battery, and the insulating films extending out of the top surfaces on the left and right large surfaces are formedIs of a first length L m1 The insulation films extending from the bottom surfaces of the left large surface and the right large surface are made to be a second length L m2 The method comprises the steps of carrying out a first treatment on the surface of the The S20 tape cutting cuts off the tape tail of the insulating film to enable the insulating film extending out of the front side surface on the left large surface and the right large surface to be of a first width W m1 The insulating films extending out of the rear side surfaces on the left large surface and the right large surface are the same as the first width W m1 ；
Specifically, a first length L m1 Second length L m2 Are all in the height direction of the battery, a first width W m1 In the length direction of the battery, the requirements of the width W of the battery are met, when W is more than or equal to 8mm, L is m1 ≥4mm，L m2 ≥W/2+2mm；W m1 ≥W/2+2mm。
Further, an insulating film length W required for pasting the left large surface or the right large surface of one cell m The requirements of the battery length L and the battery width W are met m ＝L+2W m1 When W is more than or equal to 8mm, the method satisfies W m More than or equal to L+W+4mm; width L of insulating film m To meet the requirements of the height H and the width W of the battery, L m ＝H+L m1 +L m2 Satisfy L m ≥H+1/2W+6mm。
The invention has the beneficial effects that:
according to the square-shell battery secondary coating method, two insulating film strips are used for simultaneously paving the left large surface and the right large surface from top to bottom, and then the two insulating film strips are cut; the insulating film with the left large surface extending out of the bottom surface and the insulating film with the right large surface extending out of the bottom surface are folded and stuck on the bottom surface, so that the two insulating films are mutually overlapped on the bottom surface to form an overlapping area with overlapping width D being more than or equal to 4mm, and a U-shaped film coating initial form of the battery is formed; or, folding and pasting the insulating film with the left large surface extending out of the front side surface and the insulating film with the right large surface extending out of the front side surface on the front side surface, and overlapping the insulating film and the insulating film on the front side surface to form an overlapping area with overlapping width D being more than or equal to 4mm; the insulating film with the left large surface extending out of the rear side surface and the insulating film with the right large surface extending out of the rear side surface are folded and stuck on the rear side surface, and the left large surface and the right large surface are lapped with each other on the rear side surface to form a lapping area with the lapping width D being more than or equal to 4mm; forming the initial form of the battery loop-shaped coating. The two insulating film belts are used for paving the left large surface and the right large surface from top to bottom simultaneously, so that the coating time can be shortened, and the coating production efficiency of the square-shell battery is high.
Drawings
FIG. 1 is a schematic view of a square battery structure;
FIG. 2 is a process flow diagram of a square battery secondary coating method of the present invention;
FIG. 3 is a schematic diagram of a square battery of the invention after the left and right large faces are pasted with the second coating film and then the strip is cut;
FIG. 4 is a schematic diagram of a square battery secondary coating method of the present invention after the bottom surface is folded and pasted;
FIG. 5 is a schematic diagram of a square battery secondary coating method of the invention after folding and pasting a U-shaped coating on the bottom surface;
FIG. 6 is a schematic diagram of a square battery secondary coating method of the present invention after the front and rear sides are folded and attached;
fig. 7 is a schematic diagram of the square-case battery secondary coating method of the invention after the front and rear sides are folded and pasted with the back-shape coating.
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 front side; 21. right large face;
23. and a lap zone.
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 battery two-type coating method, referring to fig. 1-7, comprising the following steps:
s10, sticking left and right large surfaces: first, the battery 100 is placed horizontally with the left large surface 12 and the right large surface 21, and two insulating film tapes obliquely arranged above the left large surface 12 and below the right large surface 21 of the battery 100 are respectively laid on the left large surface 12 and the right large surface 21, see fig. 3.
S20, cutting: cutting two insulating film stripes at predetermined positions gives two insulating film stripe sections, see fig. 3.
S30A is folded and stuck on the bottom surface: the insulating films of the left large surface 12 extending out of the bottom surface 19 and the insulating films of the right large surface 21 extending out of the bottom surface 19 are folded and adhered to the bottom surface 19, so that the two insulating films are mutually overlapped on the bottom surface 19 to form an overlapped area 23 with the overlapped width D being more than or equal to 4mm, an initial form of the U-shaped film coating of the battery is formed, the U-shaped film coating method is continuously folded and adhered according to the U-shaped film coating method, and the U-shaped film coated battery 200 can be obtained, and the U-shaped film coating film folding and adhering process is not repeated herein, and is shown in fig. 5.
Or, S30B folds the front and back sides: the insulating film of the left large surface 12 extending out of the front side surface 20 and the insulating film of the right large surface 21 extending out of the front side surface 20 are folded and stuck on the front side surface 20, so that the two insulating films are mutually overlapped on the front side surface 20 to form an overlap area 23 with the overlap width D being more than or equal to 4mm; the insulating films of the left large surface 12 extending out of the rear side surface 13 and the insulating films of the right large surface 21 extending out of the rear side surface 13 are folded and stuck to the rear side surface 13, so that the two insulating films are mutually overlapped on the rear side surface 13 to form an overlapping area 23 with the overlapping width D being more than or equal to 4mm, an initial form of a battery wrapping film is formed, the folding and sticking are continued according to a wrapping film folding method, see fig. 6, and a wrapping film folding and sticking process is omitted herein, so that a wrapping film battery 300 can be obtained. It should be noted that, the front side of the folding and pasting and the rear side of the folding and pasting are obviously not in sequence, and generally are carried out simultaneously.
Further, referring to fig. 3, when the left and right large surfaces are attached to S10, the length direction of the two insulating film tape sections is aligned with the height direction of the battery, and the insulating films extending from the front side surface 20 on the left and right large surfaces 12 and 21 are made to have a first width W m1 And the insulating films extending from the rear side surfaces 13 on the left large surface 12 and the right large surface 21 are the same as the first width W m1 The method comprises the steps of carrying out a first treatment on the surface of the S20, cutting the tape tail of the insulating film to enable the insulating film extending out of the top surface 11 on the left large surface 12 and the right large surface 21 to be of a first length L m1 The insulating film extending from the bottom surface 19 on the left large surface 12 and the right large surface 21 is made to be a second length L m2 ；
Specifically, referring to FIG. 3, a first length L m1 Second length L m2 Are all in the height direction of the battery, a first width W m1 In the length direction of the battery, the requirements of the width W of the battery are met, when W is more than or equal to 8mm, L is m1 ≥4mm，L m2 ≥W/2+2mm；W m1 ≥W/2+2mm。
Still further, referring to fig. 3, an insulation film length L required for laminating the left large face 12 or the right large face 21 of one battery 100 m To meet the requirements of the height H and the width W of the battery, L m ＝H+L m1 +L m2 When W is more than or equal to 8mm, the method satisfies L m More than or equal to H+1/2W+6mm; width W of insulating film m To meet the requirement of the battery length L, W m ＝L+2W m1 Satisfy W m ≥L+W+4mm。
Further, referring to fig. 3, when the left and right large surfaces are attached to S10, the length direction of the two insulating film tape sections is aligned with the battery length direction, and the insulating films extending from the top surface 11 on the left and right large surfaces 12 and 21 are made to be the first length L m1 The insulating film extending from the bottom surface 19 on the left large surface 12 and the right large surface 21 is made to be a second length L m2 The method comprises the steps of carrying out a first treatment on the surface of the S20, cutting off the tape tail of the insulating filmThe insulating films extending from the front side surface 20 on the left large surface 12 and the right large surface 21 are made to have a first width W m1 And the insulating films extending from the rear side surfaces 13 on the left large surface 12 and the right large surface 21 are the same as the first width W m1 ；
Specifically, referring to FIG. 3, a first length L m1 Second length L m2 Are all in the height direction of the battery, a first width W m1 In the length direction of the battery, the requirements of the width W of the battery are met, when W is more than or equal to 8mm, L is m1 ≥4mm，L m2 ≥W/2+2mm；W m1 ≥W/2+2mm。
Further, referring to fig. 3, an insulating film length W required for laminating the left large face 12 or the right large face 21 of one battery 100 m The requirements of the battery length L and the battery width W are met m ＝L+2W m1 When W is more than or equal to 8mm, the method satisfies W m More than or equal to L+W+4mm; width L of insulating film m To meet the requirements of the height H and the width W of the battery, L m ＝H+L m1 +L m2 Satisfy L m ≥H+1/2W+6mm。
When the left and right large surfaces are attached to the square-shell battery two-type coating method S10, if the width of the insulating film strips is matched with the length L of the battery, the length directions of the two insulating film strip sections are selected to be consistent with the height direction of the battery; if the width of the insulating film stripes matches the cell height H, the length direction of the two insulating film stripes is made to coincide with the length direction of the cells.
The initial form of the U-shaped coating of the battery obtained by folding and attaching the bottom surface of the S30A or the initial form of the reverse coating of the battery obtained by folding and attaching the front and rear side surfaces of the S30B is not particularly limited, and the subsequent coating device is selected according to whether the subsequent coating device is the U-shaped coating device or the reverse coating device.
The invention has the beneficial effects that:
according to the square-shell battery secondary coating method, two insulating film strips are used for pasting a left large surface and a right large surface, the left large surface 12 and the right large surface 21 are paved and pasted from top to bottom at the same time, and then the two insulating film strips are cut by a cutting strip S20; the insulating film of the left large surface 12 extending out of the bottom surface 19 and the insulating film of the right large surface 21 extending out of the bottom surface 19 are folded and stuck on the bottom surface 19 by the S30A folding and sticking bottom surface, so that the two insulating films are mutually overlapped on the bottom surface 19 to form an overlap area 23 with the overlap width D being more than or equal to 4mm, and a U-shaped film coating initial form of the battery is formed for subsequent folding and sticking according to a U-shaped film coating method to obtain a U-shaped film coated battery 200; or, then S30B folds and pastes the front and back side surfaces, the insulating film of the left large surface 12 extending out of the front side surface 20 and the insulating film of the right large surface 21 extending out of the front side surface 20 are folded and pasted on the front side surface 20, and overlap joint areas 23 with overlap joint widths D more than or equal to 4mm are formed on the front side surface 20; the insulating film of the left large surface 12 extending out of the rear side surface 13 and the insulating film of the right large surface 21 extending out of the rear side surface 13 are folded and stuck on the rear side surface 13, and overlap joint areas 23 with overlap joint widths D being more than or equal to 4mm are formed on the rear side surface 13; and forming a battery film-returning initial form for subsequent folding and pasting according to a film-returning method to obtain the film-returning battery 300.
The two insulating film strips are used for paving the left large surface 12 and the right large surface 21 from top to bottom simultaneously, so that the coating time can be shortened, and the coating production efficiency of the square-shell battery is high.
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 (5)
1. The square shell battery two-type coating method is characterized by adopting two insulating film strips to simultaneously coat so as to improve the coating efficiency of the square shell battery, and comprises the following steps of:
s10, sticking left and right large surfaces: firstly, the left large surface and the right large surface of the battery are horizontally arranged, and two insulating film belts obliquely arranged above the left large surface and below the right large surface of the battery are respectively paved and attached on the left large surface and the right large surface;
s20, cutting: cutting two insulating film strips at preset positions to obtain two insulating film strip sections;
S30A is folded and stuck on the bottom surface: the insulating film with the left large surface extending out of the bottom surface and the insulating film with the right large surface extending out of the bottom surface are folded and stuck on the bottom surface, so that the two insulating films are mutually overlapped on the bottom surface to form an overlapped area with the overlapped width D being more than or equal to 4mm, and an initial form of a U-shaped coating of the battery is formed;
or, S30B folds the front and back sides: the insulating film with the left large surface extending out of the front side surface and the insulating film with the right large surface extending out of the front side surface are folded and stuck on the front side surface, so that the two insulating films are mutually overlapped on the front side surface to form an overlapping area with overlapping width D being more than or equal to 4mm; the insulating film with the left large surface extending out of the rear side surface and the insulating film with the right large surface extending out of the rear side surface are folded and stuck on the rear side surface, so that the two insulating films are mutually overlapped on the rear side surface to form an overlapping area with the overlapping width D being more than or equal to 4mm, and an initial form of the battery wrapping film is formed.
2. The method of claim 1, wherein when the S10 is applied to the left and right large surfaces, the length direction of the two insulating film strip sections is aligned with the height direction of the battery, and the insulating films extending from the front side surfaces on the left and right large surfaces are made to have a first width W m1 The insulating films extending out of the rear side surfaces on the left large surface and the right large surface are the same as the first width W m1 The method comprises the steps of carrying out a first treatment on the surface of the The S20 tape cutting cuts off the tape tail of the insulating film to enable the insulating film extending out of the top surface on the left large surface and the right large surface to be of a first length Lm 1 The insulation films extending from the bottom surfaces of the left large surface and the right large surface are made to be a second length L m2 ；
At this time, a first length L m1 Second length L m2 Are all in the height direction of the battery, a first width W m1 In the length direction of the battery, the requirements of the width W of the battery are met, when W is more than or equal to 8mm, L is m1 ≥4mm，L m2 ≥W/2+2mm；W m1 ≥W/2+2mm。
3. The method for coating a square battery according to claim 2, wherein the insulating film length L required for the left or right large surface of one battery is coated m To meet the requirements of the height H and the width W of the battery, L m ＝H+L m1 +L m2 When W is more than or equal to 8mm, the method satisfies L m More than or equal to H+1/2W+6mm; width W of insulating film m To meet the requirement of the battery length L, W m ＝L+2W m1 Satisfy W m ≥L+W+4mm。
4. The method of claim 1, wherein when the S10 is applied to the left and right large surfaces, the length direction of the two insulating film strip sections is identical to the length direction of the battery, and the insulating films extending from the top surfaces on the left and right large surfaces are made to be a first length L m1 The insulation films extending from the bottom surfaces of the left large surface and the right large surface are made to be a second length L m2 The method comprises the steps of carrying out a first treatment on the surface of the The S20 tape cutting cuts off the tape tail of the insulating film to enable the insulating film extending out of the front side surface on the left large surface and the right large surface to be of a first width W m1 The insulating films extending out of the rear side surfaces on the left large surface and the right large surface are the same as the first width W m1 ；
At this time, a first length L m1 Second length L m2 Are all in the height direction of the battery, a first width W m1 In the length direction of the battery, the requirements of the width W of the battery are met, when W is more than or equal to 8mm, L is m1 ≥4mm，L m2 ≥W/2+2mm；W m1 ≥W/2+2mm。
5. The method of claim 4, wherein the insulating film length W is required for coating the left or right large surface of a battery m The requirements of the battery length L and the battery width W are met m ＝L+2W m1 When W is more than or equal to 8mm, the method satisfies W m More than or equal to L+W+4mm; width L of insulating film m To meet the requirements of the height H and the width W of the battery, L m ＝H+L m1 +L m2 Satisfy L m ≥H+1/2W+6mm。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311446892.3A CN117497923A (en) | 2023-11-01 | 2023-11-01 | Square shell battery two-type film coating method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311446892.3A CN117497923A (en) | 2023-11-01 | 2023-11-01 | Square shell battery two-type film coating method |
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| Publication Number | Publication Date |
|---|---|
| CN117497923A true CN117497923A (en) | 2024-02-02 |
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|---|---|---|---|
| CN202311446892.3A Pending CN117497923A (en) | 2023-11-01 | 2023-11-01 | Square shell battery two-type film coating method |
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| Country | Link |
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| CN (1) | CN117497923A (en) |
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- 2023-11-01 CN CN202311446892.3A patent/CN117497923A/en active Pending
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