Encapsulation device and lamination machine

Abstract

The embodiment of the application provides a packaging device and a lamination machine, and relates to the technical field of secondary battery manufacturing. The packaging device is used for packaging a pole piece between two layers of composite diaphragms. The packaging device comprises a rack, a bearing assembly, a driving roller and a packaging assembly. The driving roller is rotatably arranged on the rack. The bearing assembly is mounted on the rack, and the bearing assembly is located at the bottom of the driving roller. The bearing assembly is used for bearing and conveying the composite diaphragm and the pole piece. The packaging assembly is arranged on the driving roller. The packaging assembly is used for cooperating with the bearing assembly to seal the two layers of diaphragms, so as to package the pole piece in the two layers of diaphragms. The packaging assembly is rotatably arranged on the driving roller in a rotating mode, so that the packaging can be continuously and continuously carried out, thereby improving the packaging speed and improving the lamination efficiency.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of secondary battery manufacturing, in particular to a packaging device and a lamination machine. BACKGROUND

[0002] With the development of electric vehicle technology and the increase in sales, the demand for power batteries is increasing. The cell forming process of power batteries is mainly completed by a lamination machine.

[0003] With the increasing demand for cell production, the speed of the lamination process is continuously improving, and the speed and requirements for the sealing of the separator in the sheet making process are also continuously improving. The sealing speed of the existing lamination machine for sealing the pole piece has far failed to meet the demand of the current high-speed lamination. SUMMARY

[0004] The purpose of the present application includes, for example, to provide a packaging device and a lamination machine which can realize continuous high-speed packaging of pole pieces, so as to improve the lamination speed of the lamination machine to improve the production efficiency of the cell.

[0005] Embodiments of the present application can be implemented as follows:

[0006] In a first aspect, the present application provides a packaging device for packaging a pole piece between two layers of composite separators, the packaging device comprising a rack, a bearing assembly, a drive roller and a packaging assembly;

[0007] The drive roller is rotatably arranged on the rack;

[0008] The bearing assembly is mounted on the rack, and the bearing assembly is located at the bottom of the drive roller, and the bearing assembly is used to bear and transport the composite separator and the pole piece;

[0009] The packaging assembly is arranged on the drive roller, and the packaging assembly is used to cooperate with the bearing assembly to seal two layers of the separator to package the pole piece in the two layers of the separator.

[0010] In an optional embodiment, the packaging assembly comprises two separator pressing wheels, and the two separator pressing wheels are arranged at intervals on the drive roller, and are used to cooperate with the bearing assembly to seal two opposite sides of the two layers of the composite separator.

[0011] In an optional embodiment, the packaging assembly further comprises a separator pressing knife, the separator pressing knife is arranged along the radial direction of the drive roller and extends towards the axial direction of the drive roller, and the separator pressing knife is used to cooperate with the bearing assembly to seal the two layers of the composite separator in the area between the two adjacent pole pieces.

[0012] In an optional embodiment, the diaphragm pressing knife is floatingly mounted on the driving roller, and the diaphragm pressing knife is retractable in the radial direction of the driving roller; or the packaging device further comprises a driving device, the driving device is arranged on the rack, the driving roller is rotatably arranged on the driving device, and the driving device is configured to drive the driving roller to move away from or close to the bearing assembly.

[0013] In an optional embodiment, the diaphragm pressing knife comprises a heat sealing knife head and an electric heating element, the electric heating element is arranged in the heat sealing knife head along the length direction of the heat sealing knife head, the electric heating element is configured to heat the heat sealing knife head, the heat sealing knife head is arranged on the driving roller in the radial direction of the driving roller, and the heat sealing knife head is configured to cooperate with the bearing assembly to heat seal and press the two layers of the composite diaphragm between the two adjacent pole pieces.

[0014] In an optional embodiment, the diaphragm pressing knife further comprises a heat-conducting silica gel, the heat-conducting silica gel is arranged on the side of the heat sealing knife head away from the driving roller, and the heat-conducting silica gel is configured to abut against the composite diaphragm to heat seal and press the two layers of the composite diaphragm.

[0015] In an optional embodiment, the heat-conducting silica gel has an abutting surface, the abutting surface is a continuous smooth straight surface, and the abutting surface is configured to abut against the composite diaphragm to heat seal and press the two layers of the composite diaphragm; or a plurality of abutting teeth are arranged on the heat-conducting silica gel at intervals, and the plurality of abutting teeth are configured to abut against the composite diaphragm to heat seal and press the two layers of the composite diaphragm.

[0016] In an optional embodiment, the packaging device further comprises a preheating assembly, the preheating assembly is arranged on the rack, and the preheating assembly is located in front of the packaging assembly, and the preheating assembly is configured to preheat the composite diaphragm.

[0017] In an optional embodiment, the bearing assembly comprises a driving shaft, the driving shaft is mounted on the rack, and the driving shaft is arranged at the bottom of the driving roller, the driving shaft is configured to bear and convey the composite diaphragm, and the packaging assembly is configured to cooperate with the driving shaft to seal the two layers of the diaphragm to package the pole pieces in the two layers of the diaphragm.

[0018] In a second aspect, the present application provides a lamination machine, which comprises the packaging device according to any one of the foregoing embodiments.

[0019] The packaging device and the lamination machine provided by the embodiments of the present application have the following advantages, for example:

[0020] The application sets the driving roller rotatably on the frame, and sets the bearing assembly on the frame at the bottom of the driving roller, so that the bearing assembly can continuously convey the composite diaphragm and the pole piece, and sets the packaging assembly on the driving roller, so that the packaging assembly can rotate with the driving roller, thereby enabling the packaging assembly to seal the two-layer composite diaphragm and the pole piece in the two-layer diaphragm when the bearing assembly conveys the diaphragm and the pole piece, and enabling the packaging to continuously and continuously, thereby improving the packaging speed and the efficiency of the pole piece. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the application, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the application, and therefore should not be regarded as a limitation to the scope. For those skilled in the art, other related drawings can also be obtained without creative labor.

[0022] Figure 1 The structure schematic diagram of the packaging device provided by the embodiment of the application is shown in the figure.

[0023] Figure 2 The packaging effect schematic diagram of the packaging device provided by an embodiment of the application is shown in the figure.

[0024] Figure 3 The driving roller on which the packaging assembly of the packaging device provided by the embodiment of the application is set is shown in the figure.

[0025] Figure 4 The diaphragm pressing knife structure schematic diagram of the packaging device provided by the embodiment of the application is shown in the figure.

[0026] In the figure:

[0027] 100 - packaging device; 110 - frame; 111 - upper support plate; 113 - mounting seat; 115 - mounting plate; 130 - bearing assembly; 131 - driving shaft; 150 - driving roller; 170 - packaging assembly; 171 - diaphragm pressing wheel; 173 - diaphragm pressing knife; 175 - heat sealing knife head; 177 - electric heating element; 179 - mounting hole; 181 - heat-conducting silica gel; 183 - clamping part; 185 - clamping groove; 187 - abutting surface; 211 - shaft coupling; 213 - speed reducer; 215 - servo motor; 217 - heat insulation element; 219 - electric slip ring; 230 - driving device; 231 - air cylinder; 233 - connecting piece; 235 - sliding groove; 310 - pole piece; 330 - diaphragm. DETAILED DESCRIPTION

[0028] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some but not all of the embodiments of the present application. The components of the embodiments of the present application described and shown in the drawings can be arranged and designed in various different configurations.

[0029] Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed application, but merely represents selected embodiments of the application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of protection of the present application.

[0030] It should be noted that: similar reference numerals and letters represent similar items in the following drawings, therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0031] In the description of the present application, it should be noted that if the terms "upper", "lower", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship when the product of the present application is usually placed, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, therefore, it cannot be understood as a limitation on the present application.

[0032] In addition, if the terms "first", "second" and the like appear, they are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0033] It should be noted that the features in the embodiments of the present application can be combined with each other without conflict.

[0034] Please refer to Figure 1 and Figure 2 The embodiments of the present application provide a lamination machine, which comprises a packaging device 100 and a lamination device (not shown in the figure), the packaging device is used for packaging the pole piece 310 between two layers of composite diaphragm 330, and the lamination device is used for laminating the packaged pole piece 310 together to form a bare battery core.

[0035] Please refer to Figure 1 and Figure 2In the embodiment, the packaging device 100 comprises a rack 110, a carrying assembly 130, a driving roller 150 and a packaging assembly 170. The driving roller 150 is rotatably arranged on the rack 110. The carrying assembly 130 is mounted on the rack 110 and is located at the bottom of the driving roller 150. The carrying assembly 130 is used to carry and transport the composite separator 330 and the pole piece 310. The packaging assembly 170 is arranged on the driving roller 150. The packaging assembly 170 is used to cooperate with the carrying assembly 130 to seal the two layers of the composite separator 330 so as to package the pole piece 310 in the two layers of the composite separator 330.

[0036] In the embodiment, the driving roller 150 is rotatably arranged on the rack 110. The carrying assembly 130 is mounted on the rack 110 and is located at the bottom of the driving roller 150. The carrying assembly 130 is used to continuously transport the three-layer structure formed by the composite separator 330 and the pole piece 310. The packaging assembly 170 is arranged on the driving roller 150. The driving roller 150 can rotate along the movement direction to drive the packaging assembly 170 to rotate. Thus, the packaging assembly 170 can seal the two layers of the composite separator 330 to package the pole piece 310 in the two layers of the composite separator 330 when the carrying assembly 130 transports the separator 330 and the pole piece 310. The packaging is performed by rotation. Thus, the packaging can be continuously performed. The packaging speed and the efficiency of the pole piece can be improved.

[0037] It should be noted that, generally, the pole piece 310 with a size smaller than the width of the separator 330 is uniformly and intermittently placed on one layer of the composite separator 330 by a mechanical hand or the like before the pole piece 310 is packaged. Then, another layer of the composite separator 330 is used to cover the top of the pole piece 310 to form a three-layer structure. The three-layer structure is transported to the packaging station by the carrying assembly 130. Then, the packaging assembly 170 and the carrying assembly 130 are used to cooperate to package the pole piece 310.

[0038] In the embodiment, the rack 110 is a rectangular frame comprising an upper support plate 111 and a mounting seat 113 arranged oppositely and mounting plates 115 arranged on two sides. The mounting seat 113 can be used to integrate the packaging device 100 on a pole piece machine. The upper support plate 111 and the mounting plate 115 form a mounting carrier to mount the parts and assemblies of the packaging device 100.

[0039] In the embodiment, the packaging assembly 170 comprises two separator pressing wheels 171. The two separator pressing wheels 171 are arranged at intervals on the driving roller 150. The interval between the two separator pressing wheels 171 is greater than the length of the pole piece 310 and is smaller than the width of the separator 330. The two separator pressing wheels 171 are used to cooperate with the carrying assembly 130 to seal the opposite sides of the two layers of the composite separator 330. The opposite sides of the composite separator 330 are the areas shown in the area A in FIG. 6. Figure 2 In the embodiment, the packaging assembly 170 comprises two separator pressing wheels 171. The two separator pressing wheels 171 are arranged at intervals on the driving roller 150. The interval between the two separator pressing wheels 171 is greater than the length of the pole piece 310 and is smaller than the width of the separator 330. The two separator pressing wheels 171 are used to cooperate with the carrying assembly 130 to seal the opposite sides of the two layers of the composite separator 330. The opposite sides of the composite separator 330 are the areas shown in the area A in FIG. 6.

[0040] By setting two diaphragm pressing wheels 171, the two sides of the diaphragm 330 in the width direction can be conveniently sealed by the cooperation of the diaphragm pressing wheels 171 and the bearing assembly 130.

[0041] Please combine Figure 1 and Figure 2 In the embodiment, the two diaphragm pressing wheels 171 and the bearing assembly 130 cooperate to seal the two opposite sides of the two-layer composite diaphragm 330. The way is to set the diameter of the diaphragm pressing wheel 171 so that the distance between the outer periphery of the diaphragm pressing wheel 171 and the bearing surface of the bearing assembly 130 is less than the thickness of the two-layer composite diaphragm 330. By the support of the bearing assembly 130 and the extrusion of the diaphragm pressing wheel 171 during rotation, the two-layer composite diaphragm 330 is bonded together.

[0042] Of course, in some other embodiments of the application, heating equipment such as electric heating pipes can be provided on the diaphragm pressing wheel 171. The electric heating equipment can heat the two-layer composite diaphragm 330 together.

[0043] It can be understood that the diameter of the diaphragm pressing wheel 171 is greater than the diameter of the driving roller 150, and the difference between the diameters is greater than the thickness of the pole piece 310, so that the pole piece 310 is extruded between the driving roller 150 and the bearing assembly 130 during sealing to avoid the pole piece 310 from falling off and the pole piece 310 from piercing the diaphragm 330.

[0044] Please combine Figure 1 , Figure 2 and Figure 3 In the embodiment, the diaphragm pressing wheel 171 is coaxial with the driving roller 150, so that continuous sealing can be achieved during sealing. Of course, in some other embodiments of the application, the diaphragm pressing wheel 171 can be eccentrically arranged with the driving roller 150 to achieve intermittent sealing.

[0045] Secondly, in some other embodiments of the application, the number of diaphragm pressing wheels 171 can also be multiple, for example, four, two diaphragm pressing wheels 171 form a group to seal, so that multiple groups can be sealed at a time to improve the sealing efficiency.

[0046] In the embodiment, the packaging assembly 170 further comprises a diaphragm pressing knife 173, which is arranged between the two diaphragm pressing wheels 171 along the radial direction of the driving roller 150 and extends towards the axial direction of the driving roller 150. The diaphragm pressing knife 173 is used to cooperate with the bearing assembly 130 to seal the two-layer composite diaphragm 330 in the area between the two adjacent pole pieces 310. The area between the two adjacent pole pieces 310 is shown in B of Figure 2 .

[0047] The diaphragm pressing knife 173 is arranged on the driving shaft 131, and the diaphragm pressing knife 173 is driven to rotate by the driving shaft 131, so as to seal the two layers of the composite diaphragm 330 in the region between the two pole pieces 310, thereby enabling the cooperation of the diaphragm pressing wheel 171 to package each pole piece 310 in a single bag.

[0048] Specifically, the number of the diaphragm pressing knife 173 can be arranged according to the width of the pole piece 310, as long as the corresponding arc length between the two diaphragm pressing knives 173 is greater than the width of the pole piece 310.

[0049] However, in some cases, only one of the diaphragm pressing wheel 171 or the diaphragm pressing knife 173 can be installed on the driving roller 150 to achieve the packaging of the pole piece 310.

[0050] In the embodiment, the packaging device 100 further comprises a driving device 230, the driving roller 150 is installed on the rack 110 through the driving device 230, and the driving device 230 can drive the driving roller 150 to move away from or close to the bearing assembly 130, so as to change the distance between the diaphragm pressing wheel 171 and the diaphragm pressing knife 173 and the bearing surface of the bearing assembly 130.

[0051] In the embodiment, in order to synchronize the actions of the two ends of the driving roller 150, the number of the driving device 230 includes two, and the two driving devices are arranged on the two sides of the rack.

[0052] Please continue to refer to Figure 1 In the embodiment, the driving device 230 comprises a cylinder 231 and a connecting piece 233, the cylinder 231 is installed on the rack 110 and connected with the connecting piece 233, and the driving roller 150 is rotatably installed on the connecting piece 233. The mounting plate 115 is provided with a sliding groove 235, and the connecting piece 233 is movably arranged in the sliding groove 235. The cylinder 231 can move the connecting piece 233 up and down in the sliding groove 235, so as to change the distance between the diaphragm pressing wheel 171 and the diaphragm pressing knife 173 and the bearing assembly 130.

[0053] Please combine Figure 1 , Figure 2 and Figure 3In the embodiment, the diaphragm pressing knife 173 is floatingly installed on the driving roller 150, and the diaphragm pressing knife can be radially telescoped towards the driving roller 150. Since the pole piece 310 is encapsulated between the two layers of diaphragm 330, the area where the pole piece 310 is arranged between the two layers of diaphragm 330 is thicker than the thickness of the two layers of diaphragm 330, and the floating installation can avoid the loss of the pole piece 310 when the pole piece 310 is misaligned. In addition, since the thickness of the pole piece 310 and the diaphragm 330 will be different between different production batches, the diaphragm pressing knife 173 is floatingly arranged, so that it can better adapt to diaphragms 330 of different thicknesses.

[0054] In addition, the diaphragm pressing knife 173 is floatingly arranged to adjust the telescoping range of the diaphragm pressing knife 173, so as to encapsulate different models of pole pieces 310.

[0055] In general production process, the thickness of the diaphragm 330 is not much different, but the size of the pole piece 310 will change with different battery cells. In some embodiments, the diaphragm pressing knife 173 can be floatingly installed on the driving shaft 131 by a resilient member and a bolt, and the floating range of the diaphragm pressing knife 173 can be adjusted by rotating the bolt. The resilient member is arranged between the diaphragm pressing knife 173 and the driving roller 150, and the diaphragm pressing knife 173 can be radially moved along the bolt. For example, when encapsulating a large-size pole piece 310, the bolt can be unscrewed, so that the radius of the diaphragm pressing knife 173 during rotation is increased, and the route swept by the diaphragm pressing knife 173 during rotation of the same angle is longer. When encapsulating a small-size pole piece 310, the bolt can be screwed.

[0056] Of course, in some other embodiments of the present application, the diaphragm pressing knife 173 can be fixedly installed on the driving roller 150, and when encapsulating pole pieces 310 of different sizes, the number of diaphragm pressing knives 173 can be increased, or the installation position of the diaphragm pressing knife 173 can be changed, or the size of the diaphragm pressing knife 173 can be replaced, so that the diaphragm pressing knife 173 can encapsulate the area between two adjacent pole pieces 310.

[0057] Please refer to Figure 2 , Figure 3 and Figure 4 In the embodiment, the diaphragm pressing knife 173 includes a heat sealing knife head 175 and an electric heating element 177, the electric heating element 177 is arranged in the heat sealing knife head 175 along the length direction of the heat sealing knife head 175, the electric heating element is used to heat the heat sealing knife head 175, the heat sealing knife head 175 is arranged on the driving roller 150 along the radial direction of the driving roller 150, and the heat sealing knife head 175 is used to cooperate with the bearing assembly 130 to heat seal and press the two layers of composite diaphragm 330 between two adjacent pole pieces 310.

[0058] Generally, the electric heating element 177 is an electric heating tube. The electric heating element 177 is embedded in the heat sealing guide head by setting a mounting hole 179 on the heat sealing guide head 175.

[0059] In the embodiment, the diaphragm pressing knife 173 further comprises a heat-conducting silica gel 181, which is arranged on the side of the heat sealing guide head 175 away from the driving roller 150, and is used to abut against the composite diaphragm 330 to heat seal and press the two layers of the composite diaphragm 330. In the embodiment, the heat-conducting silica gel 181 is arranged to uniformly heat.

[0060] In the embodiment, the diaphragm pressing knife 173 further comprises a heat-conducting silica gel 181, which is arranged on the side of the heat sealing guide head 175 away from the driving roller 150, and is used to abut against the composite diaphragm 330 to heat seal and press the two layers of the composite diaphragm 330. In the embodiment, the heat-conducting silica gel 181 is arranged to uniformly heat.

[0061] In the embodiment, the end of the diaphragm pressing knife 173 is provided with a clamping portion 183, and the heat-conducting silica gel 181 is provided with a clamping groove 185, and the heat-conducting silica gel 181 is clamped on the clamping portion 183 of the diaphragm pressing knife 173 through the clamping groove 185. Of course, in some other embodiments of the present application, the heat-conducting silica gel 181 can be installed on the heat sealing guide head 175 by a fastener.

[0062] In the embodiment, the heat-conducting silica gel 181 has an abutting surface 187, which is a continuous smooth straight surface, and is used to abut against the composite diaphragm 330 to heat seal and press the two layers of the composite diaphragm 330. The abutting surface 187 is arranged as a smooth straight surface, so that a continuous seal can be formed in the region between the two adjacent pole pieces 310.

[0063] Of course, in some other embodiments of the present application, a plurality of abutting teeth are arranged on the heat-conducting silica gel 181 at intervals, and the abutting teeth are used to abut against the composite diaphragm 330 to heat seal and press the two layers of the composite diaphragm 330. The abutting teeth are used, so that the two layers of diaphragm 330 can be point-sealed.

[0064] In the embodiment, the packaging device further comprises a preheating assembly (not shown in the figure), which is arranged on the rack 110 and located in front of the heat sealing assembly, and is used to preheat the composite diaphragm 330. In the embodiment, the preheating assembly is arranged, so that the two diaphragms 330 can be preheated before heat sealing, thereby improving the sealing efficiency of the heat sealing assembly.

[0065] In the embodiment, the preheating assembly can be a heating plate or a hot air blower, so that the two layers of diaphragm 330 can be preheated by using the heating plate or the hot air blower.

[0066] Please refer to Figure 1In the embodiment, the bearing assembly 130 comprises a driving shaft 131, the driving shaft 131 is installed on the frame 110, and the driving shaft 131 is arranged at the bottom of the driving roller 150, the driving shaft 131 is used for bearing and conveying the composite diaphragm 330, and the packaging assembly 170 is used for cooperating with the driving shaft 131 to seal two layers of the diaphragm 330 to package the pole piece 310 in the two layers of the diaphragm 330.

[0067] The bearing assembly 130 is arranged as the driving shaft 131, so that the diaphragm 330 and the pole piece 310 can be conveyed and borne by the movement of the driving shaft 131.

[0068] Of course, in other embodiments of the application, the bearing assembly 130 can also be a plate conveyor or other equipment that can not only play a rigid bearing role but also play a transmission role.

[0069] In the embodiment, the packaging device 100 further comprises a coupling 211, a speed reducer 213 and a servo motor 215, the driving shaft 131 and one end of the driving roller 150 are provided with the coupling 211 and the speed reducer 213, and the servo motor 215 is connected with the input shaft of the speed reducer 213, so that one servo motor 215 can drive the driving roller 150 and the driving shaft 131 to rotate at the same time.

[0070] In the embodiment, the packaging device 100 further comprises a heat insulating piece 217, the heat insulating piece 217 is arranged between the driving roller 150 and the connecting piece 233, so as to avoid heat transfer to the frame 110.

[0071] In the embodiment, the packaging device 100 further comprises an electric slip ring 219, the electric slip ring 219 is installed on the driving roller 150, the power output end of the electric slip ring 219 is used for connecting the electric heating element 177, and the input end of the electric slip ring 219 is used for connecting a power supply device, such as a power control box.

[0072] In summary, the working principle and beneficial effects of the packaging device 100 and the lamination machine provided by the embodiment of the application include:

[0073] The application can continuously convey the composite diaphragm 330 and the pole piece 310 by arranging the driving roller 150 to be rotatable on the frame 110 and arranging the bearing assembly 130 on the frame 110 at the bottom of the driving roller 150, and the packaging assembly 170 is arranged on the driving roller 150, the packaging assembly 170 can rotate with the driving roller 150, so that the packaging assembly 170 can seal two layers of the composite diaphragm 330 to package the pole piece 310 in the two layers of the diaphragm 330 when the bearing assembly 130 conveys the diaphragm 330 and the pole piece 310, the packaging can be continuously carried out in a continuous manner by rotating, so that the packaging speed and the lamination efficiency can be improved.

[0074] The above merely provides the specific implementation of the present application, but the protection scope of the present application is not limited thereto, any person skilled in the art can easily think of the changes or replacements within the technical range disclosed by the present application, which should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A packaging device, characterized by The application relates to a packaging device for packaging pole pieces between two layers of composite diaphragms, which comprises a rack, a bearing assembly, a driving roller and a packaging assembly. The driving roller is rotatably arranged on the rack. The bearing assembly is arranged on the rack and is located at the bottom of the driving roller, and is used for bearing and conveying the composite diaphragms and the pole pieces. The packaging assembly is arranged on the driving roller and is used for cooperating with the bearing assembly to seal two layers of the diaphragms so as to package the pole pieces in the two layers of the diaphragms. The packaging assembly further comprises a diaphragm pressing knife which is arranged along the radial direction of the driving roller and extends towards the axial direction of the driving roller, and is used for cooperating with the bearing assembly to seal two layers of the composite diaphragms in the region between two adjacent pole pieces. The diaphragm pressing knife is floatingly arranged on the driving roller and can be telescopically extended towards the radial direction of the driving roller.

2. The packaging apparatus of claim 1, wherein, The packaging assembly comprises two diaphragm pressing wheels which are arranged on the driving roller in a spaced manner and are used for cooperating with the bearing assembly to seal two opposite sides of the two layers of the composite diaphragms.

3. The packaging apparatus of claim 1, wherein, The packaging device further comprises a driving device which is arranged on the rack, the driving roller is rotatably arranged on the driving device, and the driving device can drive the driving roller to move away from or close to the bearing assembly.

4. The packaging apparatus of claim 1, wherein, The diaphragm pressing knife comprises a heat sealing knife head and an electric heating element which is arranged in the heat sealing knife head along the length direction of the heat sealing knife head, is used for heating the heat sealing knife head, and is arranged on the driving roller along the radial direction of the driving roller and is used for cooperating with the bearing assembly to heat seal and press the two layers of the composite diaphragms between two adjacent pole pieces.

5. The packaging apparatus of claim 4, wherein, The diaphragm pressing knife further comprises heat-conducting silica gel which is arranged on the side of the heat sealing knife head away from the driving roller and is used for abutting against the composite diaphragms to heat seal and press the two layers of the composite diaphragms.

6. The packaging apparatus of claim 5, wherein, The heat-conducting silica gel has an abutting surface which is a continuous smooth straight surface and is used for abutting against the composite diaphragms to heat seal and press the two layers of the composite diaphragms; or The heat-conducting silica gel is provided with a plurality of abutting teeth which are arranged in a spaced manner and are used for abutting against the composite diaphragms to heat seal and press the two layers of the composite diaphragms.

7. The packaging apparatus according to claim 1 or 2, characterized by The packaging device further comprises a preheating assembly which is arranged on the rack and is located in front of the device, and is used for preheating the composite diaphragms.

8. The packaging apparatus according to claim 1 or 2, characterized by The bearing assembly comprises a driving shaft which is arranged on the rack and is arranged at the bottom of the driving roller, is used for bearing and conveying the composite diaphragms, and is used for cooperating with the packaging assembly to seal two layers of the diaphragms so as to package the pole pieces in the two layers of the diaphragms.

9. A lamination machine characterized by, The application further provides a packaging device comprising the packaging device according to any one of claims 1-8.

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