Vacuum film pasting device for square aluminum shell battery

Abstract

The invention provides a square aluminum shell battery vacuum film pasting device which comprises a vacuum box and a vacuum film pasting mechanism, the vacuum box is fixed on an external machine table and provides a vacuum environment for square aluminum shell battery film pasting, and the vacuum film pasting mechanism is fixed in the vacuum box and provides a vacuum environment for square aluminum shell battery film pasting. According to the vacuum film pasting device, a bare cell with an upward top surface, a downward bottom surface and a forward liquid injection opening can be pasted under vacuum, no bubble exists below the pasted insulating film, and the quality meets the requirement of cell film pasting.

Description

Technical Field

[0001] The invention belongs to the technical field of square aluminum shell battery manufacturing equipment, and in particular relates to a square aluminum shell battery vacuum film pasting device. Background Art

[0002] Please see attached Figure 1 The appearance of a coated battery (10B) of a square aluminum shell battery includes six outer surfaces, namely, a top surface (11), a bottom surface (12), a left large surface (13), a right large surface (14), a front side surface (15), and a rear side surface (16), with the top surface facing upward, the bottom surface facing downward, and the liquid injection port facing forward and standing upright. During the manufacturing process of the square aluminum shell battery, an insulating film needs to be pasted on the six outer surfaces of the bare battery (10) to play a role of electrical isolation, as well as anti-corrosion and decorative functions, and only the positive electrode column (101), the negative electrode column (102), the liquid injection port (103), the explosion-proof window (104), and the QR code (105) on the middle part of the top surface 11 are exposed.

[0003] The general insulating film tape is made into a film tape type, and adhesive is prepared on the back of the insulating film tape (20). The material of the insulating film tape (20) is a polyethylene terephthalate (PET for short), and the insulating film is generally 0.08-0.15 mm thick. The insulating film has excellent insulation, high temperature resistance, flame retardancy, heat dissipation and tensile rigidity; the adhesive is one or more of the polymer binder polyvinylidene fluoride-hexafluoropropylene copolymer, polyvinylidene fluoride, polymethyl methacrylate, polyethylene oxide, polyacrylonitrile, polystyrene, polyvinyl acetate, polyvinyl pyrrolidone, and polyurethane, and the thickness is 0.01-0.05 mm. The adhesive can be accelerated to solidify when exposed to ultraviolet light (UV), and after solidification, it has excellent insulation, wear resistance, weather resistance, folding edge, flame retardancy, and heat dissipation. The adhesive bonding strength can reach 1.5-7MPa.

[0004] In the prior art, a whole insulating film strip (20) is used to cover some surfaces of a bare cell (10) to obtain a film-coated cell (10A), and then the insulating film extending outside the film surface is folded and pasted on the remaining surfaces of the cell to obtain a coated cell (10B). According to the type of cell film, U-shaped films and circular films are commonly used.

[0005] Battery film requirements:

[0006] Cover the six outer surfaces of the bare cell as required;

[0007] Film laminating tension: 1.5±0.5kgf, film laminating pressure: 15±5kgf;

[0008] Film sticking accuracy ±1mm;

[0009] No glue, bubbles, wrinkles, corners, warping, scratches or dirt.

[0010] In the atmospheric environment, it is most likely that air will be trapped and bubbles will appear under the insulating film due to fluctuations in film laminating tension and uneven surface. For this reason, we have developed a vacuum laminating device for square aluminum shell batteries. Summary of the invention

[0011] The object of the present invention is to provide a square aluminum shell battery vacuum film pasting device, which is used for pasting films on bare cells with the top surface facing upward, the bottom surface facing downward and the liquid injection port facing forward in a vacuum state to obtain film pasted cells.

[0012] The present invention is implemented in this way: a square aluminum shell battery vacuum film laminating device comprises:

[0013] The vacuum box is fixed on the external machine table to provide a vacuum environment for the square aluminum shell battery film;

[0014] The vacuum film laminating mechanism is fixed in the vacuum box and is used for laminating the bare cell in a vacuum state with the top surface facing upward, the bottom surface facing downward and the liquid injection port facing forward.

[0015] Furthermore, the vacuum box includes a box body, a box cover, a sealing gasket, a sealed cavity, a vacuum joint and an atmosphere joint. The box body is fixed on an external machine platform and is provided with openings facing forward and upward; the box cover is adapted to the box body and is used to close the openings facing forward and upward of the box body. A sealing gasket is provided around the openings facing forward and upward of the box body. The sealed cavity is obtained after the box cover is closed with the box body. A vacuum joint connected to the sealed cavity is provided on the box body and is used to evacuate the sealed cavity. An atmosphere joint connected to the sealed cavity is provided on the box body and is used to break the vacuum of the sealed cavity.

[0016] Furthermore, the box body includes a bottom plate, a front vertical plate, two side vertical plates, a rear vertical plate and a top plate, the bottom plate is fixed on an external machine platform, the front vertical plate is fixed in front of the bottom plate, the two side vertical plates are respectively fixed on the left and right sides of the bottom plate, the rear vertical plate is fixed behind the bottom plate, and the top plate is fixed to the top surfaces of the two side vertical plates and the rear vertical plate. The front vertical plate is shorter to form an opening of the box body facing forward, and the top plate is narrower to form an opening of the box body facing upward.

[0017] Furthermore, the box cover includes a box cover front plate, a box cover top plate and two box cover grippers; the box cover front plate and the box cover top plate are fixed vertically to each other, the box cover front plate is adapted to the front opening of the box body, and the box cover top plate is adapted to the upward opening of the box body, and the sealed cavity is obtained when the box cover is closed with the box body; the two box cover grippers are separately fixed on the box cover top plate for grabbing the box cover.

[0018] Furthermore, the vacuum film pasting mechanism includes a battery clamping assembly and a battery film pasting assembly. The battery clamping assembly is fixed under the top plate and the rear vertical plate, and is used to clamp the bare cell and push the bare cell down for film pasting. The battery film pasting assembly is fixed on the bottom plate, and is used to feed in the bare cell, then feed out the pasted cell A, and tension the insulating film strip and roll the insulating film on the bare cell for film pasting.

[0019] Furthermore, the battery clamping assembly includes a battery clamping lifting driver, a battery clamping lifting slide group, a battery clamping lifting slide, a lower limit assembly, a battery clamping opening and closing driver, two battery clamps, two battery support roller brackets and a battery support roller, the battery clamping lifting driver is vertically fixed downward under the top plate, the slide rail of the battery clamping lifting slide group is vertically fixed downward on the rear vertical plate, the battery clamping lifting slide is fixed under the output end of the battery clamping lifting driver and on the slider of the battery clamping lifting slide group, the lower limit assembly is fixed on the rear vertical plate, and is located at the battery clamping The end of the slide rail of the lifting slide group is used to limit the lower limit of the battery clamping lifting slide. The battery clamping opening and closing driver is fixed under the battery clamping lifting slide, and is used to push down the bare cell for film pasting. The two battery clamps are respectively fixed on the two output ends of the battery clamping opening and closing driver, and are used to clamp the front and back of the bare cell. The two battery supporting roller brackets are fixed on both sides of the rear vertical plate and are located at the same horizontal height. The battery supporting roller is horizontally mounted on the two battery supporting roller brackets, and is used to press the left large surface or the right large surface of the bare cell to straighten the bare cell during the process of the bare cell descending for film pasting.

[0020] Furthermore, the battery film pasting assembly includes a battery advance and retreat driver, a battery advance and retreat slide group, a battery advance and retreat slide, a front limit assembly, four film stretching and lifting slide groups, two film stretching roller brackets, two film stretching rollers and two film pressing rollers; the battery advance and retreat driver is horizontally and centrally fixed to the front vertical plate, the slide rail of the battery advance and retreat slide group is fixed to the bottom plate, the battery advance and retreat slide group is fixed to the output end of the battery advance and retreat driver and to the slider of the battery advance and retreat slide group, the front limit assembly is fixed to the bottom plate, located at a predetermined position of the slide rail of the battery advance and retreat slide group, and is used to limit the forward position of the battery advance and retreat slide, and the slide rails of each of the two film stretching and lifting slide groups are respectively vertically The two film-stretching roller supports are fixed on the front side and rear side of the battery advance and retreat slide, and are respectively horizontally fixed on the sliders of the two film-stretching lifting slide groups on the front side and rear side of the battery advance and retreat slide. The two film-stretching rollers are respectively horizontally mounted on the film-stretching roller supports on the front side and rear side of the battery advance and retreat slide, and are used to simultaneously tension the two ends of the insulating film strip for film pasting. The two film-pressing rollers are respectively horizontally mounted on the front side and rear side of the top of the battery advance and retreat slide, and are parallel to the two film-stretching rollers. The distance between the two film-pressing rollers is adapted to the width of the bare battery, and are used to simultaneously roll the insulating film strip onto the left and right large surfaces of the bare battery for film pasting.

[0021] The beneficial effects of the square aluminum shell battery vacuum film sticking device of the present invention are: the vacuum box Square aluminum shell battery The film provides a vacuum environment. The vacuum film laminating mechanism is fixed in the vacuum box, and can laminat the bare battery in a vacuum state with the top surface facing upward, the bottom surface facing downward, and the liquid injection port facing forward. There are no bubbles under the laminating insulating film, and the quality meets the battery laminating requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of a square aluminum shell coated battery;

[0023] Figure 2 This is a schematic diagram of a square aluminum shell U-shaped film battery;

[0024] Figure 3 This is the structural diagram of the vacuum film laminating device for square aluminum shell batteries;

[0025] Figure 4 This is the structural diagram of the box and vacuum film-sticking mechanism;

[0026] Figure 5 This is a structural diagram of the battery clamping assembly;

[0027] Figure 6 This is a structural diagram of the battery film assembly.

[0028] Description of reference numerals:

[0029] 10. Bare cell; 10A. Film cell; 10B. Coated cell; 11. Top surface; 101. Positive column; 102. Negative column; 103. Liquid filling port; 104. Explosion-proof window; 105. QR code; 12. Bottom surface; 13. Left large surface; 14. Right large surface; 15. Front; 16. Back; 20. Insulating film strip;

[0030] 100, vacuum box; 110, box body; 111, bottom plate; 112, front plate; 113, side plate; 114, rear plate; 115, top plate;

[0031] 120, box cover; 121, box cover front plate; 122, box cover top plate; 123, box cover gripper;

[0032] 130, sealing pad; 140, sealing chamber; 150, vacuum joint; 160, atmosphere joint;

[0033] 200. Vacuum film laminating mechanism;

[0034] 210, battery clamping assembly; 211, battery clamping lifting driver; 212, battery clamping lifting slide group; 213, battery clamping lifting slide; 214, lower limit assembly; 215, battery clamping opening and closing driver; 216, battery clamp; 217, battery support roller bracket; 218, battery support roller;

[0035] 220, battery film pasting assembly; 221, battery advance and retreat driver; 222, battery advance and retreat slide group; 223, battery advance and retreat slide rack; 224, front limit assembly; 225, film stretching lifting slide group; 226, film stretching roller bracket; 227, film stretching roller; 228, film pressing roller. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0037] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "front", "rear", "vertical", "horizontal", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention; the terms "first", "second", and "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance; in addition, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium, or it can be a connection between the two components. For ordinary technicians in this field, the specific meanings of the terms in the present invention can be understood according to specific circumstances.

[0038] See also Figure 3 This embodiment provides a square aluminum shell battery vacuum film laminating device, which is used to laminating a bare battery 10 with a top surface 11 facing upward, a bottom surface 12 facing downward, and a liquid injection port 103 facing forward in a vacuum state to obtain a film-laminated battery 10A. The square aluminum shell battery vacuum film laminating device includes:

[0039] The vacuum box 100 is fixed on the external machine platform to provide a vacuum environment for the square aluminum shell battery film;

[0040] The vacuum film laminating mechanism 200 is fixed in the vacuum box 100 and is used to laminat the bare cell 10 in a vacuum state with the top surface 11 facing upward, the bottom surface 12 facing downward, and the liquid injection port 103 facing forward.

[0041] Further, see Figure 3 The vacuum box 100 includes a box body 110, a box cover 120, a sealing gasket 130, a sealed cavity 140, a vacuum joint 150 and an atmosphere joint 160. The box body 110 is fixed on an external machine platform and is provided with forward and upward openings; the box cover 120 is adapted to the box body 110 and is used to close the forward and upward openings of the box body 110. A sealing gasket 130 is provided around the forward and upward openings of the box body 110. After the box cover 120 covers the box body 110, a sealed cavity 140 is obtained. A vacuum joint 150 connected to the sealed cavity 140 is provided on the box body 110 and is used to evacuate the sealed cavity 140. An atmosphere joint 160 connected to the sealed cavity 140 is provided on the box body 110 and is used to break the vacuum of the sealed cavity 140.

[0042] Further, see Figure 4The box body 110 includes a bottom plate 111, a front vertical plate 112, two side vertical plates 113, a rear vertical plate 114 and a top plate 115. The bottom plate 111 is fixed on an external machine platform, the front vertical plate 112 is fixed in front of the bottom plate 111, the two side vertical plates 113 are respectively fixed on the left and right sides of the bottom plate 111, the rear vertical plate 114 is fixed behind the bottom plate 111, and the top plate 115 is fixed on the top surfaces of the two side vertical plates 113 and the rear vertical plate 114. The front vertical plate 112 is shorter, forming an opening of the box body 110 facing forward, and the top plate 115 is narrower, forming an opening of the box body 110 facing upward.

[0043] Further, see Figure 3 The box cover 120 includes a box cover front plate 121, a box cover top plate 122 and two box cover grippers 123; the box cover front plate 121 and the box cover top plate 122 are fixed vertically to each other, the box cover front plate 121 is adapted to the front opening of the box body 110, and the box cover top plate 122 is adapted to the upward opening of the box body 110. After the box cover 120 covers the box body 110, a sealed cavity 140 is obtained; two box cover grippers 123 are separately fixed on the box cover top plate 122 for grabbing the box cover 120.

[0044] Further, see Figure 4 The vacuum film pasting mechanism 200 includes a battery clamping assembly 210 and a battery film pasting assembly 220. The battery clamping assembly 210 is fixed under the top plate 115 and on the rear vertical plate 114, and is used to clamp the bare cell 10 and push the bare cell 10 down for film pasting. The battery film pasting assembly 220 is fixed on the bottom plate 111, and is used to feed in the bare cell 10, then feed out the pasted cell 10A, and tension the insulating film strip 20 and roll the insulating film on the bare cell 10 for film pasting.

[0045] Further, see Figure 5The battery clamping assembly 210 includes a battery clamping lifting driver 211, a battery clamping lifting slide group 212, a battery clamping lifting slide 213, a lower limit assembly 214, a battery clamping opening and closing driver 215, two battery clamps 216, two battery support roller brackets 217 and a battery support roller 218. The battery clamping lifting driver 211 is fixed vertically downward under the top plate 115, and the slide rail of the battery clamping lifting slide group 212 is fixed vertically downward on the rear vertical plate 114. The battery clamping lifting slide 213 is fixed under the output end of the battery clamping lifting driver 211 and on the slider of the battery clamping lifting slide group 212. The lower limit assembly 214 is fixed on the rear vertical plate 114, which is located at the battery clamping lifting driver 211. The end of the slide rail of the slide group 212 is used to limit the lower limit of the battery clamping and lifting slide 213. The battery clamping opening and closing driver 215 is fixed under the battery clamping and lifting slide 213, and is used to push down the bare cell 10 for film pasting. The two battery clamps 216 are respectively fixed on the two output ends of the battery clamping and opening and closing driver 215, and are used to clamp the front 15 and the back 16 of the bare cell 10. The two battery supporting roller brackets 217 are fixed on both sides of the rear vertical plate 114 and are located at the same horizontal height. The battery supporting roller 218 is horizontally mounted on the two battery supporting roller brackets 217, and is used to press the left large surface 13 or the right large surface 14 of the bare cell 10 to straighten the bare cell 10 when the bare cell 10 is lowered for film pasting.

[0046] Further, see Figure 6The battery film pasting assembly 220 includes a battery advance and retreat driver 221, a battery advance and retreat slide group 222, a battery advance and retreat slide 223, a front limit assembly 224, four film stretching and lifting slide groups 225, two film stretching roller brackets 226, two film stretching rollers 227 and two film pressing rollers 228; the battery advance and retreat driver 221 is horizontally and centrally fixed on the front vertical plate 112, the slide rail of the battery advance and retreat slide group 222 is fixed on the bottom plate 111, the battery advance and retreat slide 223 is fixed on the output end of the battery advance and retreat driver 221 and on the slide of the battery advance and retreat slide group 222, the front limit assembly 224 is fixed on the bottom plate 111, and is located at a predetermined position of the slide rail of the battery advance and retreat slide group 222, and is used to limit the forward position of the battery advance and retreat slide 223, and the slide rails of the two film stretching and lifting slide groups 225 are fixed on the bottom plate 111. The rails are respectively vertically fixed on the front side and rear side of the battery advance and retreat slide 223, and the two film stretching roller brackets 226 are respectively horizontally fixed on the sliders of the two film stretching lifting slide groups 225 on the front side and rear side of the battery advance and retreat slide 223. The two film stretching rollers 227 are respectively horizontally mounted on the film stretching roller brackets 226 on the front side and rear side of the battery advance and retreat slide 223, and are used to simultaneously tension the two ends of the insulating film band segment 20 for film pasting. The two film pressing rollers 228 are respectively horizontally mounted on the front side and rear side of the top of the battery advance and retreat slide 223, and are parallel to the two film stretching rollers 227. The distance between the two film pressing rollers 228 is adapted to the width of the bare cell 10, and are used to simultaneously roll the insulating film band segment 20 onto the left large surface 13 and the right large surface 14 of the bare cell 10 for film pasting.

[0047] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A square aluminum shell battery vacuum film laminating device, used for laminating a bare battery (10) with a top surface (11) facing upward, a bottom surface (12) facing downward, and a liquid injection port (103) facing forward in a vacuum state to obtain a film-laminated battery (10A), comprising: The vacuum box (100) is fixed on the external machine platform to provide a vacuum environment for the square aluminum shell battery film; The vacuum film laminating mechanism (200) is fixed in the vacuum box (100) and is used to laminat the bare cell (10) in a vacuum state with the top surface (11) facing upward, the bottom surface (12) facing downward, and the liquid injection port (103) facing forward.

2. According to the square aluminum shell battery vacuum film laminating device of claim 1, the vacuum box (100) comprises a box body (110), a box cover (120), a sealing gasket (130), a sealing cavity (140), a vacuum joint (150) and an atmospheric joint (160), the box body (110) is fixed on an external machine platform and is provided with a forward and upward opening; the box cover (120) is adapted to the box body (110) and is used to close the forward and upward openings of the box body (110), and the box body (110) is provided with a vacuum joint (150) and an atmospheric joint (160). A sealing gasket (130) is provided around the front and upward openings of the box body (110); the sealed cavity (140) is obtained after the box cover (120) covers the box body (110); a vacuum joint (150) connected to the sealed cavity (140) is provided on the box body (110) and is used to evacuate the sealed cavity (140); and an atmospheric joint (160) connected to the sealed cavity (140) is provided on the box body (110) and is used to break the vacuum of the sealed cavity (140).

3. According to the square aluminum shell battery vacuum film sticking device according to claim 2, the box body (110) includes a bottom plate (111), a front vertical plate (112), two side vertical plates (113), a rear vertical plate (114) and a top plate (115), the bottom plate (111) is fixed on an external machine, the front vertical plate (112) is fixed in front of the bottom plate (111), the two side vertical plates (113) are respectively fixed on the left and right sides of the bottom plate (111), the rear vertical plate (114) is fixed behind the bottom plate (111), and the top plate (115) is fixed on the top surfaces of the two side vertical plates (113) and the rear vertical plate (114), the front vertical plate (112) is shorter, forming an opening of the box body (110) facing forward, and the top plate (115) is narrower, forming an opening of the box body (110) facing upward.

4. According to the square aluminum shell battery vacuum film sticking device of claim 3, the box cover (120) comprises a box cover front plate (121), a box cover top plate (122) and two box cover grippers (123); the box cover front plate (121) and the box cover top plate (122) are fixed vertically to each other, the box cover front plate (121) is adapted to the front opening of the box body (110), and the box cover top plate (122) is adapted to the upward opening of the box body (110), and the box cover (120) covers the box body (110) to obtain the sealed cavity (140); the two box cover grippers (123) are separately fixed on the box cover top plate (122) for grabbing the box cover (120).

5. According to the square aluminum shell battery vacuum laminating device of claim 3, the vacuum laminating mechanism (200) comprises a battery clamping assembly (210) and a battery laminating assembly (220), the battery clamping assembly (210) is fixed under the top plate (115) and on the rear vertical plate (114), and is used to clamp the bare battery (10) and push the bare battery (10) downward for laminating, and the battery laminating assembly (220) is fixed on the bottom plate (111), and is used to feed in the bare battery (10), then feed out the laminating battery (10A), and tension the insulating film strip (20) and roll the insulating film on the bare battery (10) for laminating.

6. According to the square aluminum shell battery vacuum laminating device of claim 3, the battery clamping assembly (210) comprises a battery clamping lifting driver (211), a battery clamping lifting slide group (212), a battery clamping lifting slide (213), a lower limit assembly (214), a battery clamping opening and closing driver (215), two battery clamps (216), two battery support roller brackets (217) and a battery support roller (218), the battery clamping lifting driver (211) is fixed vertically downward under the top plate (115), the slide rail of the battery clamping lifting slide group (212) is fixed vertically downward on the rear vertical plate (114), the battery clamping lifting slide (213) is fixed under the output end of the battery clamping lifting driver (211) and on the slider of the battery clamping lifting slide group (212), and the lower limit assembly (214) is fixed on the rear vertical plate (114). ), located at the end of the slide rail of the battery clamping and lifting slide group (212), used to limit the lower limit of the battery clamping and lifting slide (213), the battery clamping opening and closing driver (215) is fixed under the battery clamping and lifting slide (213), used to push down the bare battery (10) for film pasting, the two battery clamps (216) are respectively fixed to the two output ends of the battery clamping and opening and closing driver (215), used to clamp the front (15) and the rear (16) of the bare battery (10), the two battery supporting roller brackets (217) are fixed on both sides of the rear vertical plate (114), located at the same horizontal height, the battery supporting roller (218) is horizontally mounted on the two battery supporting roller brackets (217), used to press the left large surface (13) or the right large surface (14) of the bare battery (10) to straighten the bare battery (10) during the process of the bare battery (10) descending for film pasting.

7. According to the square aluminum shell battery vacuum film laminating device of claim 3, the battery film laminating assembly (220) comprises a battery advance and retreat driver (221), a battery advance and retreat slide group (222), a battery advance and retreat slide frame (223), a front limit assembly (224), four film stretching and lifting slide groups (225), two film stretching roller brackets (226), two film stretching rollers (227) and two film pressing rollers (228); the battery advance and retreat driver (221) is horizontally fixed in the center of the front vertical plate (112), the slide rail of the battery advance and retreat slide group (222) is fixed on the base plate (111), the battery advance and retreat slide (223) is fixed on the output end of the battery advance and retreat driver (221) and on the slide block of the battery advance and retreat slide group (222), the front limit assembly (224) is fixed on the base plate (111) and is located at a predetermined position of the slide rail of the battery advance and retreat slide group (222), and is used to limit the forward position of the battery advance and retreat slide (223), The slide rails of each of the two film stretching and lifting slide groups (225) are respectively vertically fixed on the front side and the rear side of the battery advance and retreat slide (223); the two film stretching roller brackets (226) are respectively horizontally fixed on the sliders of each of the two film stretching and lifting slide groups (225) on the front side and the rear side of the battery advance and retreat slide (223); the two film stretching rollers (227) are respectively horizontally mounted on the film stretching roller brackets (226) on the front side and the rear side of the battery advance and retreat slide (223); 226), used for simultaneously tensioning the two ends of the insulating film strip (20) for film lamination, the two film pressing rollers (228) are respectively horizontally mounted on the front side and the rear side of the top of the battery advance and retreat slide (223), parallel to the two film stretching rollers (227), the distance between the two film pressing rollers (228) is adapted to the width of the bare battery (10), and are used for simultaneously rolling the insulating film strip (20) onto the left large surface (13) and the right large surface (14) of the bare battery (10) for film lamination.

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