Vacuum film pasting device for square aluminum shell battery

Abstract

The application 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 to provide a vacuum environment for the square aluminum shell battery film pasting. The vacuum film pasting mechanism is fixed in the vacuum box and can past the film on the naked battery in a vertical posture with the top surface upward, the bottom surface downward and the liquid injection port forward under the vacuum. There is no air bubble under the pasted insulating film, and the quality meets the battery film pasting requirement.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of square aluminum shell battery manufacturing equipment, and particularly relates to a square aluminum shell battery vacuum film pasting device. BACKGROUND

[0002] Please see the attached Figure 1 , according to the posture of the top surface upward, the bottom surface downward, the liquid injection port forward and the vertical, the appearance of a film-wrapped battery (10B) of a square aluminum shell battery includes six outer surfaces, i.e., 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). During the manufacturing process of the square aluminum shell battery, an insulating film needs to be pasted on the six outer surfaces of a bare battery (10) to play an electrical isolation role, and also play a corrosion prevention and decoration role, and only the positive pole (101), the negative pole (102), the liquid injection port (103), the anti-explosion window (104) and the two-dimensional code (105) on the middle part of the top surface 11 are exposed.

[0003] Generally, the insulating film tape is made into a type of film tape, and an adhesive is prepared on the back of the insulating film tape (20). The material of the insulating film tape (20) is polyethylene terephthalate (PET), and the insulating film is generally 0.08-0.15 mm thick, and has excellent insulating property, high temperature resistance, flame resistance, heat dissipation and stretching rigidity. The adhesive is one or more of polyvinylidene fluoride-hexafluoropropylene copolymer, polyvinylidene fluoride, polymethyl methacrylate, polyethylene oxide, polyacrylonitrile, polystyrene, polyvinyl acetate, polyvinylpyrrolidone and polyurethane, and is 0.01-0.05 mm thick. The adhesive can be accelerated to solidify under ultraviolet (UV) irradiation, and after solidification, has excellent insulating property, wear resistance, weather resistance, folding property, flame resistance and heat dissipation, and the adhesive bonding strength can reach 1.5-7 MPa.

[0004] In the prior art, a whole insulating film tape segment (20) is used to paste some surfaces of a bare battery (10) to obtain a film-pasted battery (10A), and then the insulating film extending out of the pasted surface is used to fold and paste the remaining surfaces of the battery to obtain a film-wrapped battery (10B). According to the film pasting type of the battery, commonly used are U-shaped film pasting and back-shaped film pasting.

[0005] Battery film pasting requirements:

[0006] Paste the six outer surfaces of the bare battery according to the requirements;

[0007] The film pasting tension is 1.5±0.5 kgf, and the film pasting pressure is 15±5 kgf;

[0008] The film pasting precision is ±1 mm;

[0009] There is no gumming, bubbles, wrinkles, horns, warping, scratches and dirt.

[0010] In the atmospheric environment, the most easily caused by the film tension fluctuation, surface unevenness causes the appearance of the bubble under the insulating film, for this we research and development square aluminum shell battery vacuum film device. SUMMARY

[0011] The purpose of the present application is to provide a square aluminum shell battery vacuum film device for the naked battery in the vacuum under the film to get the film battery.

[0012] The present application is achieved, a square aluminum shell battery vacuum film device comprises:

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

[0014] Vacuum film mechanism, fixed in the vacuum box, for the naked battery in the vacuum under the film to the top surface upward, the bottom surface downward, the injection port forward vertical posture.

[0015] Further, the vacuum box includes a box, a box cover, a sealing gasket, a sealed cavity, a vacuum joint and an atmospheric joint, the box is fixed on the external machine, is equipped with the opening to the front and upward; the box cover is adapted to the box, for closing the box to the front and upward opening, is equipped with the sealing gasket around the box to the front and upward opening, the box cover is closed after the box obtains the sealed cavity, is equipped with the vacuum joint on the box, for the sealed cavity vacuumizing, is equipped with the atmospheric joint on the box, for the sealed cavity breaking vacuum.

[0016] Further, the box 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 the external machine, the front vertical plate is fixed on the front of the bottom plate, two side vertical plates are respectively fixed on the left and right sides of the bottom plate, the rear vertical plate is fixed on the back of the bottom plate, the top plate is fixed on the top surface of two side vertical plates and the rear vertical plate, the front vertical plate is relatively short, forming the opening of the box to the front, the top plate is relatively narrow, forming the opening of the box to the top.

[0017] Further, the box cover includes a box cover front plate, a box cover top plate and two box cover handles; the box cover front plate and the box cover top plate are fixed together vertically, the box cover front plate is adapted to the opening of the box to the front, the box cover top plate is adapted to the opening of the box to the top, the box cover is closed after the box obtains the sealed cavity; two box cover handles are separately fixed on the box cover top plate for grabbing the box cover.

[0018] Further, the vacuum film pasting mechanism comprises a battery clamping assembly and a battery film pasting assembly, the battery clamping assembly is fixed on the top plate and the rear vertical plate, used for clamping the bare battery and pushing down the bare battery for film pasting, the battery film pasting assembly is fixed on the bottom plate, used for feeding the bare battery, feeding out the battery A pasted with film, tensioning the insulation film strip and rolling the insulation film on the bare battery for film pasting.

[0019] Further, the battery clamping assembly comprises a battery clamping lifting driver, a battery clamping lifting slide group, a battery clamping lifting carriage, a lower limit assembly, a battery clamping opening and closing driver, two battery clamping tongs, two battery supporting roller supports and a battery supporting roller, the battery clamping lifting driver is vertically fixed downward on 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 carriage is fixed on the output end of the battery clamping lifting driver and the slide block of the battery clamping lifting slide group, the lower limit assembly is fixed on the rear vertical plate and located at the end of the slide rail of the battery clamping lifting slide group, used for limiting the lower limit of the battery clamping lifting carriage, the battery clamping opening and closing driver is fixed below the battery clamping lifting carriage, used for pushing down the bare battery for film pasting, the two battery clamping tongs are respectively fixed on the two output ends of the battery clamping opening and closing driver, used for clamping the front and rear of the bare battery, the two battery supporting roller supports are fixed on the two sides of the rear vertical plate and located at the same horizontal height, the battery supporting roller is horizontally arranged on the two battery supporting roller supports, used for supporting the bare battery during the process of film pasting.

[0020] Further, the battery film pasting assembly comprises a battery advancing and retreating driver, a battery advancing and retreating sliding group, a battery advancing and retreating sliding frame, a front limiting assembly, four film stretching lifting sliding groups, two film stretching roller supports, two film stretching rollers and two film pressing rollers; the battery advancing and retreating driver is horizontally and centrally fixed on the front vertical plate, the sliding rails of the battery advancing and retreating sliding group are fixed on the bottom plate, the battery advancing and retreating sliding frame is fixed on the output end of the battery advancing and retreating driver and the sliding block of the battery advancing and retreating sliding group, the front limiting assembly is fixed on the bottom plate and located at a predetermined position of the sliding rails of the battery advancing and retreating sliding group, used for limiting the position of the advancing of the battery advancing and retreating sliding frame, the sliding rails of each two film stretching lifting sliding groups are vertically fixed on the front side and the rear side of the battery advancing and retreating sliding frame respectively, the two film stretching roller supports are horizontally fixed on the sliding blocks of each two film stretching lifting sliding groups on the front side and the rear side of the battery advancing and retreating sliding frame respectively, the two film stretching rollers are horizontally arranged on the film stretching roller supports on the front side and the rear side of the battery advancing and retreating sliding frame respectively, used for simultaneously stretching two ends of the insulating film strip for film pasting, and the two film pressing rollers are horizontally arranged in the front side and the rear side of the top of the battery advancing and retreating sliding frame respectively, parallel to the two film stretching rollers, the distance between the two film pressing rollers is adapted to the width of the bare battery, used for simultaneously rolling and pressing the insulating film strip on the left large surface and the right large surface of the bare battery for film pasting.

[0021] The square aluminum shell battery vacuum film pasting device has the advantages that the vacuum box The square aluminum shell battery The film provides a vacuum environment, The vacuum film pasting mechanism is fixed in the vacuum box, and the bare battery in the posture of the top surface upward, the bottom surface downward and the liquid injection port forward can be pasted with the insulating film under the vacuum, the pasted insulating film has no bubbles and meets the quality requirements of battery film pasting. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 It is a schematic diagram of the square aluminum shell envelope battery;

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

[0024] Figure 3 It is a structural diagram of the square aluminum shell battery vacuum film pasting device;

[0025] Figure 4 It is a structural diagram of the box body and the vacuum film pasting mechanism;

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

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

[0028] BRIEF DESCRIPTION OF DRAWINGS

[0029] 10, bare cell; 10A, film pasting cell; 10B, film wrapping cell; 11, top surface; 101, positive pole; 102, negative pole; 103, liquid injection port; 104, anti-explosion window; 105, two-dimensional code; 12, bottom surface; 13, left large surface; 14, right large surface; 15, front surface; 16, back surface; 20, insulating film strip segment;

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

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

[0032] 130, sealing gasket; 140, sealing cavity; 150, vacuum extraction joint; 160, atmospheric joint;

[0033] 200, vacuum film pasting mechanism;

[0034] 210, cell clamping assembly; 211, cell clamping lifting driver; 212, cell clamping lifting slide group; 213, cell clamping lifting carriage; 214, lower limit assembly; 215, cell clamping opening and closing driver; 216, cell clamping tongs; 217, cell supporting roller support; 218, cell supporting roller;

[0035] 220, cell film pasting assembly; 221, cell feeding and withdrawing driver; 222, cell feeding and withdrawing slide group; 223, cell feeding and withdrawing slide carriage; 224, front limit assembly; 225, film stretching lifting slide group; 226, film stretching roller support; 227, film stretching roller; 228, film pressing roller. DETAILED DESCRIPTION

[0036] In order to make the objectives, technical solutions and advantages of the present application clearer, the present application is further described in detail below in combination with the drawings and examples. It should be understood that the specific examples described herein are only used to explain the present application and do not limit the present application.

[0037] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "front", "back", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application; the terms "first", "second", "third" are only for the purpose of description, and cannot be understood as indicating or implying relative importance; in addition, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting" should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be directly connected, or indirectly connected through an intermediate medium, or the communication between two components. For those of ordinary skill in the art, the specific meaning of the terms in the present application can be understood according to the specific circumstances.

[0038] Referring to Figure 3 The embodiment provides a square aluminum shell battery vacuum film pasting device for pasting a film on a bare battery 10 in an upright posture with the top surface 11 upward, the bottom surface 12 downward and the liquid injection port 103 forward to obtain a film-pasted battery 10A under vacuum. The square aluminum shell battery vacuum film pasting device comprises:

[0039] A vacuum box 100 is fixed on an external machine table to provide a vacuum environment for film pasting of the square aluminum shell battery.

[0040] A vacuum film pasting mechanism 200 is fixed in the vacuum box 100 and is used for pasting a film on the bare battery 10 in an upright posture with the top surface 11 upward, the bottom surface 12 downward and the liquid injection port 103 forward under vacuum.

[0041] Further, referring to Figure 3 The vacuum box 100 comprises a box body 110, a box cover 120, a sealing gasket 130, a sealing cavity 140, a vacuum connection 150 and an atmospheric connection 160. The box body 110 is fixed on an external machine table and is provided with a forward and upward opening. The box cover 120 is adapted to the box body 110 and is used for closing the forward and upward opening of the box body 110. The sealing gasket 130 is arranged around the forward and upward opening of the box body 110. The box cover 120 is closed on the box body 110 to obtain the sealing cavity 140. The vacuum connection 150 is arranged on the box body 110 and communicates with the sealing cavity 140, and is used for vacuumizing the sealing cavity 140. The atmospheric connection 160 is arranged on the box body 110 and communicates with the sealing cavity 140, and is used for breaking the vacuum of the sealing cavity 140.

[0042] Further, referring to Figure 4The box body 110 comprises 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 the external machine table. 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. 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 relatively low, forming an opening of the box body 110 facing forward. The top plate 115 is relatively narrow, forming an opening of the box body 110 facing upward.

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

[0044] Further, referring to Figure 4 The vacuum film pasting mechanism 200 comprises a battery clamping assembly 210 and a battery film pasting assembly 220. The battery clamping assembly 210 is fixed below the top plate 115 and on the rear vertical plate 114, used for clamping the bare battery 10 and pushing the bare battery 10 downward for film pasting. The battery film pasting assembly 220 is fixed on the bottom plate 111, used for feeding the bare battery 10, feeding out the film-pasted battery 10A, tensioning the insulation film strip 20 and rolling the insulation film on the bare battery 10 for film pasting.

[0045] Further, referring to Figure 5The battery clamping assembly 210 comprises a battery clamping lifting driver 211, a battery clamping lifting slide group 212, a battery clamping lifting carriage 213, a lower limit assembly 214, a battery clamping opening and closing driver 215, two battery clamping pincers 216, two battery supporting roller supports 217 and battery supporting rollers 218. The battery clamping lifting driver 211 is fixed vertically downward under the top plate 115. The slide rails of the battery clamping lifting slide group 212 are fixed vertically downward on the back stand 114. The battery clamping lifting carriage 213 is fixed on the output end of the battery clamping lifting driver 211 and on the slide block of the battery clamping lifting slide group 212. The lower limit assembly 214 is fixed on the back stand 114 at the end of the slide rails of the battery clamping lifting slide group 212, and is used to limit the lower limit of the battery clamping lifting carriage 213. The battery clamping opening and closing driver 215 is fixed under the battery clamping lifting carriage 213, and is used to push down the bare battery 10 for film pasting. The two battery clamping pincers 216 are respectively fixed on the two output ends of the battery clamping opening and closing driver 215, and are used to clamp the front face 15 and the back face 16 of the bare battery 10. The two battery supporting roller supports 217 are fixed on the two sides of the back stand 114 at the same horizontal height. The battery supporting rollers 218 are horizontally arranged on the two battery supporting roller supports 217, and are used to press against the left large face 13 or the right large face 14 of the bare battery 10 to support the bare battery 10 during the process of film pasting.

[0046] Further, referring to Figure 6The battery film pasting assembly 220 comprises a battery advancing and retreating driver 221, a battery advancing and retreating slide group 222, a battery advancing and retreating slide bracket 223, a front limiting assembly 224, four film stretching and lifting slide groups 225, two film roller supports 226, two film stretching rollers 227 and two film pressing rollers 228. The battery advancing and retreating driver 221 is horizontally and centrally fixed on the front vertical plate 112. The slide rails of the battery advancing and retreating slide group 222 are fixed on the bottom plate 111. The battery advancing and retreating slide bracket 223 is fixed on the output end of the battery advancing and retreating driver 221 and the slide block of the battery advancing and retreating slide group 222. The front limiting assembly 224 is fixed on the bottom plate 111 and located at a predetermined position of the slide rails of the battery advancing and retreating slide group 222, for limiting the position of the forward movement of the battery advancing and retreating slide bracket 223. The slide rails of each two film stretching and lifting slide groups 225 are vertically fixed on the front side and the rear side of the battery advancing and retreating slide bracket 223 respectively. The slide blocks of the two film stretching and lifting slide groups 225 are horizontally fixed on the front side and the rear side of the battery advancing and retreating slide bracket 223 respectively. The two film stretching rollers 227 are horizontally arranged on the film roller supports 226 on the front side and the rear side of the battery advancing and retreating slide bracket 223 respectively, for simultaneously stretching the two ends of the insulation film strip 20 for film pasting. The two film pressing rollers 228 are horizontally arranged in the front side and the rear side of the top of the battery advancing and retreating slide bracket 223 respectively, 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, for simultaneously rolling and pressing the insulation film strip 20 on the left large face 13 and the right large face 14 of the bare battery 10 for film pasting.

[0047] The above only describes the preferred embodiments of the present application and should not be used to limit the present application. Any modification, equivalent replacement and improvement within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A vacuum film pasting device for square aluminum shell batteries, used for pasting film on a naked battery (10) in an upright posture with the top surface (11) upward, the bottom surface (12) downward, and the liquid injection port (103) forward to obtain a film-pasted battery (10A) under vacuum, comprising: a vacuum box (100) fixed on an external machine table, providing a vacuum environment for film pasting of square aluminum shell batteries; the vacuum box (100) comprises a box body (110) including a bottom plate (111), a front vertical plate (112), two side vertical plates (113), a rear vertical plate (114), and a top plate (115); a vacuum film pasting mechanism (200) fixed in the vacuum box (100), used for pasting film on the naked battery (10) in the upright posture with the top surface (11) upward, the bottom surface (12) downward, and the liquid injection port (103) forward under vacuum, the vacuum film pasting mechanism (200) comprising a battery clamping assembly (210) and a battery film pasting assembly (220), the battery clamping assembly (210) being fixed below the top plate (115) and on the rear vertical plate (114), used for clamping and pushing down the naked battery (10) for film pasting, the battery film pasting assembly (220) being fixed on the bottom plate (111), used for feeding in the naked battery (10), feeding out the film-pasted battery (10A) after pasting film, tensioning the insulation film strip (20), and rolling the insulation film on the naked battery (10) for film pasting. 2.The vacuum film pasting device for square aluminum shell batteries according to claim 1, wherein the vacuum box (100) further comprises a box cover (120), a sealing gasket (130), a sealing cavity (140), a vacuum extraction joint (150), and an atmospheric joint (160), the box body (110) is fixed on an external machine table and is provided with openings forward and upward; the box cover (120) is adapted to the box body (110), used for closing the openings forward and upward of the box body (110), and is provided with a sealing gasket (130) around the openings forward and upward of the box body (110), the box cover (120) obtains the sealing cavity (140) after covering the box body (110), the box body (110) is provided with a vacuum extraction joint (150) communicating with the sealing cavity (140), used for vacuum extraction of the sealing cavity (140), and is provided with an atmospheric joint (160) communicating with the sealing cavity (140), used for breaking vacuum of the sealing cavity (140). ​ ​ ​ 3. The square aluminum shell battery vacuum film pasting device according to claim 2, wherein the bottom plate (111) of the box (110) is fixed on an external machine table, 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 relatively low, forming an opening of the box (110) facing forward, and the top plate (115) is relatively narrow, forming an opening of the box (110) facing upward.

4. The square aluminum shell battery vacuum film pasting device according to claim 3, wherein the box cover (120) comprises a box cover front plate (121), a box cover top plate (122), and two box cover handles (123); the box cover front plate (121) and the box cover top plate (122) are fixed perpendicularly to each other, the box cover front plate (121) is adapted to the opening of the box (110) facing forward, and the box cover top plate (122) is adapted to the opening of the box (110) facing upward; after the box cover (120) covers the box (110), the sealed cavity (140) is obtained; and the two box cover handles (123) are separately fixed on the box cover top plate (122) for grabbing the box cover (120).

5. The square aluminum shell battery vacuum film pasting device according to 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 carriage (213), a lower limit assembly (214), a battery clamping opening and closing driver (215), two battery clamping jaws (216), two battery supporting roller supports (217) and a battery supporting roller (218), the battery clamping lifting driver (211) is fixed vertically downward below the top plate (115), the slide rails of the battery clamping lifting slide group (212) are fixed vertically downward on the back vertical plate (114), the battery clamping lifting carriage (213) is fixed below the output end of the battery clamping lifting driver (211) and on the slide block of the battery clamping lifting slide group (212), the lower limit assembly (214) is fixed on the back vertical plate (114) and located at the end of the slide rails of the battery clamping lifting slide group (212) to limit the lower limit of the battery clamping lifting carriage (213), the battery clamping opening and closing driver (215) is fixed below the battery clamping lifting carriage (213) to push down the bare battery (10) for film pasting, the two battery clamping jaws (216) are respectively fixed on the two output ends of the battery clamping opening and closing driver (215) to clamp the front face (15) and the back face (16) of the bare battery (10), the two battery supporting roller supports (217) are fixed on the two sides in the back vertical plate (114) and located at the same horizontal height, and the battery supporting roller (218) is horizontally arranged on the two battery supporting roller supports (217) to support the left large face (13) or the right large face (14) of the bare battery (10) to support the bare battery (10) during the process of film pasting.

6. The square aluminum shell battery vacuum film pasting device according to claim 3, the The battery film pasting assembly (220) comprises a battery advancing and retreating driver (221), a battery advancing and retreating slide group (222), a battery advancing and retreating slide frame (223), a front limiting assembly (224), four film stretching and lifting slide groups (225), two film roller supports (226), two film rollers (227) and two film pressing rollers (228); the battery advancing and retreating driver (221) is horizontally and centrally fixed on the front vertical plate (112); the slide rail of the battery advancing and retreating slide group (222) is fixed on the bottom plate (111); the battery advancing and retreating slide frame (223) is fixed on the output end of the battery advancing and retreating driver (221) and the sliding block of the battery advancing and retreating slide group (222); the front limiting assembly (224) is fixed on the bottom plate (111) and located at a predetermined position of the slide rail of the battery advancing and retreating slide group (222) to limit the position of the forward movement of the battery advancing and retreating slide frame (223); the slide rails of two film stretching and lifting slide groups (225) are vertically fixed on the front side and the rear side of the battery advancing and retreating slide frame (223) respectively; the film roller supports (226) are horizontally fixed on the sliding blocks of the film stretching and lifting slide groups (225) on the front side and the rear side of the battery advancing and retreating slide frame (223) respectively; the film rollers (227) are horizontally arranged on the film roller supports (226) on the front side and the rear side of the battery advancing and retreating slide frame (223) respectively to simultaneously stretch two ends of the insulation film strip (20) for film pasting; the film pressing rollers (228) are horizontally arranged in the front side and the rear side of the top of the battery advancing and retreating slide frame (223) respectively, parallel to the film rollers (227), and the distance between the film pressing rollers (228) is adapted to the width of the bare battery (10) to simultaneously roll and press the insulation film strip (20) onto the left large surface (13) and the right large surface (14) of the bare battery (10) for film pasting.

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