Membrane unit between battery piece pasters

Abstract

The invention relates to the technical field of battery piece film pasting, and discloses a battery piece film pasting unit which comprises a welding conveying end and a welding end and is characterized by further comprising a film pasting unit which is located between the welding conveying end and the welding end and connected with the welding conveying end and the welding end. The film pasting unit comprises a battery piece conveying unit and a film strip supply unit, and the battery piece conveying unit is located between the battery piece input module at the welding conveying end and the battery piece transmission module at the welding end and communicates with the battery piece input module at the welding conveying end and the battery piece transmission module at the welding end; the film strip supply unit places a film strip on a battery piece on the battery piece conveying unit; and a heating unit is arranged on the whole conveying path of the battery piece conveying unit. The method has the effect of reducing subfissure of the battery pieces caused by negative spacing in the lamination process of the battery pieces.

Description

A cell patch interlayer membrane unit Technical Field

[0001] This application relates to the field of battery cell bonding technology, and in particular to a battery cell bonding interlayer membrane unit. Background Technology

[0002] A solar cell stringer is an automated piece of equipment used in the manufacture of photovoltaic modules. Its function is to connect multiple independent solar cells into strings using solder ribbons, thus forming the core power generation unit of a solar panel. In conventional stringing processes, infrared heating is typically used to weld solder ribbons onto the front and back main grid lines of adjacent cells, achieving electrical connection between the cells. This type of equipment generally includes multiple functional modules such as cell loading, solder ribbon supply, solder ribbon laying, positioning and pressing, and welding, and is widely used in large-scale production processes in the photovoltaic industry.

[0003] Existing application number 2025113774988 discloses a multi-segment ultra-high-speed string welding machine, including a housing, and a welding input end, a welding end, and a welding output end sequentially arranged within the housing. The welding input end includes a tape supply section, which includes two sets of tape supply units arranged in a vertically mirrored manner. The welding end includes: a transmission unit, comprising two sets of parallel-arranged cell transmission modules, and a mesh pressing input module disposed at the end of the cell transmission modules; a tape making unit, comprising two sets of tape pulling assemblies; and a welding unit, comprising a welding transmission module located at the end of the tape pulling assembly and on the side of the transmission unit, and a welding transmission module disposed on the welding transmission module. The upper welding chamber; each set of belt pulling components includes: a belt pulling adjustment module, including a belt pulling moving module and a belt pulling lifting module connected to the belt pulling moving module; belt pulling arms, designed in two sets, each set including a belt pulling frame connected to the belt pulling lifting module, a belt pulling motor set at the end of the belt pulling frame, a belt pulling screw connected to the output end of the belt pulling motor and inserted into the belt pulling frame, and a belt pulling movable frame sleeved on the belt pulling screw; the side of the belt pulling frame is provided with a belt pulling slide rail, and the side of the belt pulling movable frame is provided with a belt pulling slider adapted to the belt pulling slide rail; the belt pulling movable frame is provided with multiple belt pulling moving teeth, and the belt pulling frame is provided with multiple belt pulling fixing teeth adapted to the belt pulling moving teeth.

[0004] However, as photovoltaic module technology develops towards higher energy density, negative spacing technology, which can improve module efficiency, has gradually become the industry mainstream. But when the cell spacing is negative, factors such as thermal stress, mechanical pressure or positioning deviation during the welding process can easily lead to microcracks between cells, which not only affect the mechanical strength of the cells, but may also cause performance degradation and reliability decline during long-term operation. Summary of the Invention

[0005] To reduce microcracks in solar cells caused by negative spacing during lamination, this application provides a film unit between solar cell patches.

[0006] This application provides a cell-to-cell film unit with the following technical solution: A cell-to-cell film unit includes a welding conveying end and a welding end, and also includes a film-applying unit. The film-applying unit is located between the welding conveying end and the welding end, and connects the welding conveying end and the welding end. The film-applying unit includes a cell conveying unit and a film strip supply unit, wherein: the cell conveying unit is located between the cell input module of the welding conveying end and the cell transmission module of the welding end, and connects the cell input module of the welding conveying end and the cell transmission module of the welding end; the film strip supply unit places the film strip on the cell on the cell conveying unit; a heating unit is provided on the overall conveying path of the cell conveying unit.

[0007] Optionally, the film strip supply unit includes a film supply unit, a film cutting unit, and a film conveying unit, wherein: the film cutting unit is used to cut the film supply unit into film strips; and the film conveying unit is used to convey the film strips onto the battery cells of the battery cell conveying unit.

[0008] Optionally, the film supply unit includes a film winding unit and a film pulling unit, wherein: the film winding unit and the film pulling unit are located on both sides of the film cutting unit; the film pulling unit pulls the film on the film winding unit onto the film cutting unit.

[0009] Optionally, the film winding unit includes a placement frame and an adjustment frame, wherein: a drive shaft is horizontally mounted on the placement frame, the drive shaft is rotatably coupled to the placement frame, a film is mounted on the drive shaft, and a film winding motor is mounted on the placement frame and drivenly connected to the drive shaft; a tensioning wheel assembly is mounted on the adjustment frame, the tensioning wheel assembly includes a fixed wheel, a tensioning wheel, and a reversing wheel, wherein: the fixed wheel is installed at a predetermined position on the adjustment frame, a tensioning slider is provided at the end of the tensioning wheel, a guide rod is vertically mounted on the adjustment frame and passes through the tensioning slider, a tensioning spring is sleeved on the guide rod, one end of the tensioning spring is connected to the tensioning slider, and the other end of the tensioning slider is located at the bottom end of the adjustment frame.

[0010] Optionally, the film stretching unit includes a film lifting component and a film stretching component, wherein: the film lifting component includes a film lifting frame, an upper pressure film plate, and a lower pressure film plate, wherein: the upper pressure film plate is disposed above the lower pressure film plate and forms a film lifting channel; the upper pressure film plate moves vertically via an upper pressure lifting drive unit; the lower pressure film plate moves vertically via a lower pressure lifting drive unit; the film stretching component includes a film stretching frame, a film stretching linear drive component, a film stretching clamping drive component, and a film stretching clamping plate assembly, wherein: the film stretching linear drive component is disposed at the top of the film stretching frame, the film stretching clamping drive component is disposed at the push rod end of the film stretching linear drive component, and the film stretching clamping plate assembly is disposed on the film stretching clamping drive component and is joined or separated by the film stretching clamping drive component.

[0011] Optionally, the film cutting unit includes a film cutting frame and a rotary cutter, wherein: the top of the film cutting frame is provided with a film cutting platform, and a plurality of film cutting grooves are provided in parallel on the film cutting platform; the rotary cutter is placed in the film cutting groove, and its top extends out of the upper surface of the film cutting platform; the rotary cutter is rotated by a rotation drive unit and moves along the length direction of the film cutting groove by a cutter horizontal movement unit.

[0012] Optionally, the film conveying unit includes a film strip cutting and conveying unit, a film strip temporary storage unit, and a film strip attaching and conveying unit, wherein: the film strip cutting and conveying unit has multiple sets of film cutting adsorption holes at its bottom, the film cutting adsorption holes are connected to the film cutting negative pressure supply unit, the film strip cutting and conveying unit moves horizontally via a horizontal film cutting conveying unit and vertically via a vertical film cutting conveying unit; the film strip temporary storage unit includes a film strip conveyor belt unit and a recycling frame, wherein: the recycling frame is located at the end of the film strip conveyor belt unit; the film strip attaching and conveying unit has multiple film strip attaching adsorption holes at its bottom, the film strip attaching adsorption holes are connected to the film strip attaching negative pressure supply unit, the film strip attaching and conveying unit moves horizontally via a horizontal film strip attaching drive unit and vertically via a vertical film strip attaching drive unit.

[0013] Optionally, the upper pressure plate or the lower pressure plate is provided with a film-pulling adsorption hole, which is connected to the film-pulling negative pressure supply unit.

[0014] In summary, this application includes at least one of the following beneficial technical effects: 1. By pre-applying flexible film strips, a buffer layer is formed on the surface of the battery cell, which can effectively absorb and disperse the concentrated stress caused by the negative spacing layout during lamination and welding, thereby significantly reducing the risk of microcracks at the edges of the battery cell and in the contact areas.

[0015] 2. The multi-unit collaborative membrane material processing flow ensures the consistency of membrane strip size, the accuracy of application position, and the reliability of incoming material quality, thereby improving process stability from multiple aspects.

[0016] 3. By employing a preheating method throughout the entire process, the membrane strip softens and adheres instantly upon contact. This avoids secondary displacement of the membrane strip that may occur with traditional post-heating, ensuring a fixed and uniformly adhered buffer layer, and providing stable elastic protection for the battery cell during subsequent high-voltage lamination processes. Attached Figure Description

[0017] Figure 1 is a schematic diagram of the overall structure of an embodiment of this application.

[0018] Figure 2 is a schematic diagram showing the relative positions of the film supply unit and the film cutting unit in an embodiment of this application.

[0019] Figure 3 is a schematic diagram illustrating the relative positions of the placement rack and the adjustment rack in an embodiment of this application.

[0020] Figure 4 is a schematic diagram showing the relative positions of the lifting film member and the pulling film member in an embodiment of this application.

[0021] Figure 5 is a schematic diagram illustrating the structure of the cutting unit in an embodiment of this application.

[0022] Figure 6 is a schematic diagram illustrating the structure of the membrane strip cutting and conveying unit in an embodiment of this application.

[0023] Figure 7 is a schematic diagram showing the relative positions of the membrane cutting adsorption hole and the membrane strip cutting and conveying unit in an embodiment of this application.

[0024] Figure 8 is a schematic diagram illustrating the structure of the membrane strip temporary storage unit in an embodiment of this application.

[0025] Figure 9 is a schematic diagram illustrating the structure of the film strip conveying unit in an embodiment of this application.

[0026] Figure 10 is a schematic diagram of the structure of the battery cell delivery unit in an embodiment of this application.

[0027] Explanation of reference numerals in the attached drawings: 1. Film strip supply unit; 2. Battery cell conveying unit; 21. Heating unit; 3. Film supply unit; 31. Film winding unit; 311. Placement rack; 3111. Drive shaft; 3112. Film winding motor; 312. Adjustment rack; 3121. Tensioning wheel assembly; 3122. Fixed wheel; 3123. Tensioning wheel; 3124. Reversing wheel; 3125. Guide rod; 3126. Tensioning slider; 2127. Tensioning spring; 32. Film pulling unit; 321. Film lifting component; 3211. Film lifting frame; 3212. Upper pressure plate; 3213. Lower pressure plate; 3214. Upper pressure lifting drive unit; 3215. Lower pressure lifting drive unit; 322. Film pulling component; 32 21. Film pulling frame; 3222. Film pulling linear drive; 3223. Film pulling clamping drive; 3224. Film pulling clamping plate assembly; 4. Film cutting unit; 41. Film cutting frame; 411. Film cutting platform; 412. Film cutting groove; 42. Rotary cutter; 5. Film conveying unit; 51. Film strip cutting and conveying unit; 511. Film cutting adsorption hole; 512. Horizontal film cutting and conveying unit; 513. Vertical film cutting and conveying unit; 52. Film strip temporary storage unit; 521. Film strip conveyor belt unit; 522. Recycling frame; 523. Vision camera; 53. Film strip applying and conveying unit; 531. Film strip applying adsorption hole; 532. Horizontal film strip applying drive unit; 533. Vertical film strip applying drive unit. Detailed Implementation

[0028] The present application will be further described in detail below with reference to Figures 1-10.

[0029] This application discloses a cell patch interlayer membrane unit.

[0030] A cell-mounting interlayer film unit includes a welding conveying end and a welding end, and also integrates a film-mounting unit. The film-mounting unit is disposed between the welding conveying end and the welding end, and is connected to both. The film-mounting unit internally includes a cell conveying unit 2 and a film strip supply unit 1. The cell conveying unit 2 is located between the cell input module at the welding conveying end and the cell transfer module at the welding end, serving to connect and link these two modules. The film strip supply unit 1 is responsible for laying the film strip onto the surface of the cell carried by the cell conveying unit 2. A heating unit 21 is installed along the overall conveying path of the cell conveying unit 2.

[0031] The solar cells are transferred from the solar cell input module at the welding conveyor end to the solar cell conveying unit 2 of the laminating unit. The solar cells are conveyed forward on the solar cell conveying unit 2. When the solar cell reaches a predetermined position below the film strip supply unit 1, the film strip supply unit 1 is activated, releasing a fixed-length film strip and laying it on the target area of ​​the solar cell.

[0032] Throughout the forward transport of the solar cells on the solar cell transport unit 2, they are continuously heated by the heating units 21 arranged along the transport path, causing their temperature to rise steadily. When the preheated solar cell reaches the film application position below the film strip supply unit 1, it has become a heat source itself. At this time, the film strip supply unit 1 activates, releasing the cut film strip and laying it onto the target area on the hot solar cell surface. Upon contact with the high-temperature solar cell, the film strip quickly softens and adheres firmly. The applied solar cell is then sent out of the solar cell transport unit 2 and enters the solar cell transfer module at the welding end.

[0034] By pre-laying a flexible film strip on the surface of the solar cells, an elastic buffer layer is provided between the closely arranged or even overlapping solar cells, and between the solar cells and the pressing fixture, during subsequent lamination and welding processes. This effectively absorbs and disperses localized stresses caused by misalignment, mechanical pressure, or concentrated thermal stress, significantly reducing the risk of microcracks in the solar cells during manufacturing and providing greater process safety for modules designed with high energy density. The heating unit 21 mainly consists of multiple heating tubes installed on the solar cells in the conveying unit 2.

[0035] The membrane strip supply unit 1 consists of a membrane supply unit 3, a membrane cutting unit 4, and a membrane conveying unit 5. The membrane supply unit 3 stores and releases continuous membrane material. The membrane cutting unit 4 is located downstream of the membrane supply unit 3, and its function is to cut the continuous membrane material drawn from the membrane supply unit 3 into independent membrane strips of a specified length. The membrane conveying unit 5 is located after the membrane cutting unit 4, and its function is to pick up and transfer the cut membrane strips, and finally lay them onto the surface of the solar cells carried by the solar cell conveying unit 2.

[0036] During operation, the film supply unit 3 operates first, continuously releasing the rolled film forward. The film is drawn to the cutting unit 4, which precisely cuts it to the set length, generating individual film strips. Subsequently, the film conveying unit 5 starts, picking up the cut film strips. Next, the film conveying unit 5 transports the film strips above the solar cell conveying unit 2, aligns them with the positions of the solar cells on the conveyor belt, and finally smoothly places the film strips onto the designated area surface of the solar cells.

[0037] The film supply unit 3 consists of a film winding unit 31 and a film pulling unit 32. The film winding unit 31 and the film pulling unit 32 are respectively arranged on both sides of the film cutting unit 4. The film winding unit 31 is used to carry the film roll and release the film material. The film pulling unit 32 is used to pull the film material released from the film winding unit 31 and pull it flat to the working position of the film cutting unit 4.

[0038] During operation, the film pulling unit 32 is activated first, clamping the end of the film material drawn from the film winding unit 31. Subsequently, the film pulling unit 32 moves away from the film winding unit 31, thereby pulling the film material from the film roll of the film winding unit 31. After the film material has been pulled through the set stroke, it is conveyed and laid flat in the designated cutting area of ​​the film cutting unit 4, waiting for the film cutting unit 4 to perform the cutting operation.

[0039] The film winding unit includes a placement frame 311 and an adjustment frame 312. A drive shaft 3111 is horizontally mounted on the placement frame 311, forming a rotatable engagement with the placement frame 3111. A film winding motor 3112 is also mounted on the placement frame 311, and the film winding motor 3112 is drively connected to the drive shaft 3111.

[0040] A tensioning wheel assembly 3121 is mounted on the adjusting frame 312. The tensioning wheel assembly 3121 consists of a fixed wheel 3122, a tensioning wheel 3123, and a reversing wheel 3124. The fixed wheel 3122 is installed at a predetermined position on the adjusting frame 312. A tensioning slider 3126 is connected to the end of the tensioning wheel 3123. A guide rod 3125 is vertically mounted on the adjusting frame 312, passing through the tensioning slider 3126. A tension spring 2127 is fitted onto the guide rod 3125; one end of the tension spring 2127 is connected to the tensioning slider 3126, and the other end is located at the bottom of the adjusting frame 312.

[0041] During operation, the membrane roll motor 3112 starts according to instructions, driving the drive shaft 3111 and the membrane roll to rotate, releasing the membrane material. The released membrane material first passes over the fixed wheel 3122 mounted on the adjustment, and then passes over the tension wheel 3123 and the reversing wheel 3124. When the tension of the membrane material changes, it forces the tension wheel 3123 to move, causing the tension slider 3126 to slide along the vertical guide rod 3125, thereby compressing or stretching the tension spring 2127. The reaction force generated by the tension spring 2127 acts on the tension wheel 3123, balancing and adjusting the tension of the membrane material in real time, so that the membrane material is transported to the downstream film cutting unit 4 in a stable state.

[0042] The film stretching unit 32 consists of a film lifting member 321 and a film stretching member 322. The film lifting member 321 includes a film lifting frame 3211 and an upper pressure plate 3212 and a lower pressure plate 3213 mounted on the film lifting frame 3211. The upper pressure plate 3212 is located directly above the lower pressure plate 3213, and a film lifting channel for the film material to pass through is formed between the two.

[0043] The upper pressure plate 3212 is connected to an upper pressure lifting drive unit 3214, which can drive it to move in the vertical direction; the lower pressure plate 3213 is connected to a lower pressure lifting drive unit 3215, which can also drive it to move in the vertical direction.

[0044] The film stretching unit 32 consists of a film lifting member 321 and a film stretching member 322. The film lifting member 321 includes a film lifting frame 3211, and an upper pressure plate 3212 and a lower pressure plate 3213 mounted on the film lifting frame 3211. The upper pressure plate 3212 is located directly above the lower pressure plate 3213, forming a film lifting channel through which the film material can pass. The upper pressure plate 3212 is connected to an upper pressure lifting drive unit 3214, which can drive it to move in the vertical direction; the lower pressure plate 3213 is connected to a lower pressure lifting drive unit 3215, which can also drive it to move in the vertical direction.

[0045] The membrane stretching component 322 includes a membrane stretching frame 3221, a membrane stretching linear drive 3222, a membrane stretching clamping drive 3223, and a set of membrane stretching clamping plates 3224. The membrane stretching linear drive 3222 is mounted on the top of the membrane stretching frame 3221. The membrane stretching clamping drive 3223 is mounted on the end of the push rod of the membrane stretching linear drive 3222. The membrane stretching clamping plate set 3224 is mounted on the membrane stretching clamping drive 3223 and can achieve closing or opening actions through the drive of the membrane stretching clamping drive 3223. The membrane stretching clamping drive 3223 is a cylinder, specifically a clamping cylinder.

[0046] Initially, the upper pressure plate 3212 and lower pressure plate 3213 of the lifting film member 321 are separated, opening the lifting film channel. The film pulling clamping plate assembly 3224 of the pulling film member 322 closes, clamping the end of the membrane material extending from upstream into the channel. Then, the film pulling linear drive 3222 is activated, pushing the film pulling clamping drive 3223 and the clamped membrane material to move horizontally, pulling the membrane material out a predetermined length. After the membrane material reaches the predetermined position, the upper pressure plate 3212 and lower pressure plate 3213 of the lifting film member 321 move rapidly towards each other under the drive of their respective drive units, pressing and fixing the membrane material within the lifting film channel.

[0047] At this time, the downstream film cutting unit 4 performs the cutting. After cutting, the film pulling clamping plate assembly 3224 is released, and the film pulling linear drive component 3222 retracts, driving the clamping mechanism to reset to the starting point. Simultaneously, the film lifting channel opens, ready to enter the next working cycle. During the film pulling process, the film material moves freely within the open channel, and the traction stroke is precisely controlled by the linear drive component to ensure that the length of each segment of film material is consistent. At the moment of film cutting, the film material is firmly clamped by the film lifting component 321, effectively preventing vibration or displacement during cutting, ensuring a smooth cut, and isolating the film cutting action from the tension impact on the upstream film supply system.

[0048] A membrane-stretching adsorption hole is provided on the upper pressure plate 3212 or the lower pressure plate 3213. The membrane-stretching adsorption hole is connected to an independent membrane-stretching negative pressure supply unit through a pipeline. After the upper pressure plate 3212 and the lower pressure plate 3213 are completely closed, the membrane-stretching negative pressure supply unit is activated, and the negative pressure is transmitted to the adsorption hole on the pressure plate through the pipeline, thereby generating suction to tightly adsorb the membrane material onto the surface of the pressure plate. At this time, the membrane material is firmly fixed by both mechanical and pneumatic forces, and then the downstream film-cutting unit 4 performs cutting. After the cutting action is completed, the membrane-stretching negative pressure supply unit first closes to release the adsorption, and then the pressure plate opens to start the next working cycle.

[0049] The film cutting unit 4 mainly consists of a film cutting frame 41 and a rotary cutter 42. A film cutting platform 411 is fixedly mounted on the top of the film cutting frame 41. Multiple film cutting grooves 412 are arranged in parallel on the film cutting platform 411. The rotary cutter 42 is placed inside these film cutting grooves 412, with its blade tip extending beyond the upper surface of the film cutting platform 411. The rotary cutter 42 is driven by a rotary drive unit to rotate around its own axis. Simultaneously, the rotary cutter 42 is also connected to a cutter horizontal movement unit, which drives the rotary cutter 42 to move horizontally reciprocally along the length of the film cutting grooves 412. The rotary drive unit is a motor, and the cutter horizontal movement unit is a belt module.

[0050] During operation, after the membrane material is pulled and laid flat by the upstream film-pulling unit 32 and fixed at a predetermined position above the film-cutting platform 411, the film-cutting unit 4 begins to operate. First, the rotary drive unit starts, driving all the rotary cutters 42 to rotate at high speed. Then, the horizontal movement unit of the cutters operates, driving these high-speed rotating cutters as a whole to move uniformly from one end to the other along the guide of the film-cutting groove 412. During the movement, the rotating blades cut the membrane material along multiple parallel predetermined paths. After completing one stroke of cutting, the horizontal movement unit of the cutters drives the rotary cutters 42 to reset, the rotary drive unit stops, and it waits for the next cutting command. The multiple membrane strips formed by the cutting are then taken away by the downstream film-carrying unit 5.

[0051] Compared to vertical punching, rotary cutting exerts less instantaneous impact on the membrane material, effectively reducing stretching or deformation at the cut and ensuring a smooth, burr-free cut. The parallel multi-groove design enables multiple cuts to be completed in a single operation, resulting in high production efficiency.

[0052] The film conveying unit 5 consists of three parts: a film strip cutting and conveying unit 51, a film strip temporary storage unit 52, and a film strip attaching and conveying unit 53.

[0053] The bottom of the membrane strip cutting and conveying unit 51 is provided with multiple sets of membrane cutting adsorption holes 511, which are connected to an independent membrane cutting negative pressure supply unit through pipelines. The membrane strip cutting and conveying unit 51 is integrally connected to a horizontal membrane cutting conveying unit 512, which can be driven to move in the horizontal direction; at the same time, it is also connected to a vertical membrane cutting conveying unit 513, which can be driven to move in the vertical direction. Both the horizontal membrane cutting conveying unit 512 and the vertical membrane cutting conveying unit 513 are lead screw modules.

[0054] The membrane strip temporary storage unit 52 includes a membrane strip conveyor belt unit 521 and a recycling box 522, which is located at the end of the membrane strip conveyor belt unit 521.

[0055] The bottom of the membrane strip application conveying unit 53 is provided with multiple membrane strip application adsorption holes 531, which are connected to the membrane strip application negative pressure supply unit. The membrane strip application conveying unit 53 is integrally connected to a horizontal membrane strip application drive unit 532, which can drive it to move horizontally; simultaneously, it is also connected to a vertical membrane strip application drive unit 533, which can drive it to move vertically. Both the horizontal membrane strip application drive unit 532 and the vertical membrane strip application drive unit 533 are lead screw modules.

[0056] During the film cutting process, the film strip cutting and conveying unit 51 first descends to its bottom plane and presses against the film material to be cut, keeping it stable and flat during the cutting process. After cutting, the film cutting negative pressure supply unit is activated, and the suction generated by the bottom film cutting suction hole 511 simultaneously attracts multiple cut film strips. Subsequently, the film strip cutting and conveying unit 51 rises and, driven by the horizontal conveying unit, carries the film strips to above the starting end of the conveyor belt unit of the film strip temporary storage unit 52, where the film strips are released.

[0057] The film strip cutting and conveying unit 51 consists of a mounting frame and multiple independent adsorption frames. Multiple sets of film cutting adsorption holes 511 at its bottom are located on these adsorption frames. All adsorption frames are connected to a lead screw module, which drives all adsorption frames to move synchronously, allowing for adjustment of their edge distances, bringing them closer together or further apart.

[0058] When film pressing is required, the film strip cutting and conveying unit 51 descends under the drive of the vertical film cutting and conveying unit 513. At this time, multiple adsorption frames are in a closed state, and their bottoms form a single flat surface, pressing down on the film material to be cut to maintain stability. After cutting is completed, the film cutting negative pressure supply unit is activated, and the film cutting adsorption holes 511 on each adsorption frame simultaneously adsorb the corresponding film strip. Subsequently, the unit rises, and according to the command, the screw module begins to move, driving all adsorption frames to move outward synchronously to the preset separation position, so that the adsorbed multiple film strips are dispersed.

[0059] During pressing, the closed suction frame provides a stable and reliable clamping force, ensuring cutting quality. During transfer, the active dispersion function of the membrane strips avoids problems such as mutual adhesion, collision, or positional interference that may occur when multiple membrane strips are placed side by side.

[0060] The conveyor belt transports the film strips forward, where they are inspected by a vision camera 523. Qualified products remain at the front-end pick-up station, while unqualified products are sent to the end and fall into the recycling box 522. Next, the film strip application and conveying unit 53 moves above the qualified product pick-up station in the temporary storage unit, picks up the film strips using negative pressure adsorption, and then moves above the battery cell conveying unit 2. After aligning with the target position on the battery cell, the negative pressure is released, and the film strip is applied to the surface of the battery cell.

[0061] The membrane strip cutting and conveying unit 51, with its pressure function during cutting, ensures the stability of the membrane material and the cutting quality. The membrane strip temporary storage unit 52 buffers the production cycle and removes defective products online, ensuring that only qualified membrane strips enter the final application stage, thus improving the overall yield. The negative pressure involved in this embodiment is provided by corresponding vacuum pumps.

[0062] The implementation principle of a film unit for battery cell bonding in an embodiment is as follows: The film feeding unit 31 unwinds the film, and after the tension of the film is adjusted by the tensioning wheel group 3121, it is guided by the lifting member 321 of the film pulling unit 32, clamped and pulled by the film pulling member 322 to the film cutting platform 411 of the film cutting unit 4; during cutting, the film strip cutting and conveying unit 51 presses down to stabilize the film, and the rotating cutter 42 moves along the film cutting groove 412 to complete multiple synchronous cuts; subsequently, the film strip cutting and conveying unit 51 adsorbs the cut film strips and transfers them to the conveyor belt unit of the film strip temporary storage unit 52 for buffering and screening, and unqualified products fall into the recycling box 522; finally, the film strip bonding and conveying unit 53 picks up qualified film strips from the temporary storage unit, accurately positions them through horizontal and vertical movement, and applies the film strips to the designated area of ​​the battery cell on the battery cell conveying unit 2, and is preheated and fixed by the heating unit 21.

[0063] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A film unit for inter-laminar bonding of battery cells, comprising a welding conveying end and a welding end, characterized in that: It also includes a film-applying unit, which is located between and connects the welding conveying end and the welding end. The film-applying unit includes a cell conveying unit and a film strip supply unit, wherein: the cell conveying unit is located between the cell input module of the welding conveying end and the cell transmission module of the welding end, and connects the cell input module of the welding conveying end and the cell transmission module of the welding end; the film strip supply unit places the film strip onto the cell on the cell conveying unit; and a heating unit is provided on the overall conveying path of the cell conveying unit.

2. The interlayer film unit for battery cells according to claim 1, characterized in that: The membrane strip supply unit includes a membrane supply unit, a membrane cutting unit, and a membrane conveying unit, wherein: the membrane cutting unit is used to cut the membrane supply unit into membrane strips; and the membrane conveying unit is used to convey the membrane strips onto the battery cells of the battery cell conveying unit.

3. The interlayer film unit for battery cells according to claim 2, characterized in that: The film supply unit includes a film winding unit and a film pulling unit, wherein the film winding unit and the film pulling unit are located on both sides of the film cutting unit; the film pulling unit pulls the film on the film winding unit onto the film cutting unit.

4. The interlayer film unit for battery cells according to claim 3, characterized in that: The film winding unit includes a placement frame and an adjustment frame, wherein: a drive shaft is horizontally mounted on the placement frame, the drive shaft is rotatably coupled to the placement frame, a film is mounted on the drive shaft, and a film winding motor is mounted on the placement frame and drivenly connected to the drive shaft; a tensioning wheel assembly is mounted on the adjustment frame, the tensioning wheel assembly includes a fixed wheel, a tensioning wheel, and a reversing wheel, wherein: the fixed wheel is installed at a predetermined position on the adjustment frame, a tensioning slider is provided at the end of the tensioning wheel, a guide rod is vertically mounted on the adjustment frame and passes through the tensioning slider, a tensioning spring is sleeved on the guide rod, one end of the tensioning spring is connected to the tensioning slider, and the other end of the tensioning slider is located at the bottom end of the adjustment frame.

5. A cell-mount interlayer film unit according to claim 3, characterized in that: The film stretching unit includes a film lifting component and a film stretching component, wherein: the film lifting component includes a film lifting frame, an upper pressure film plate, and a lower pressure film plate, wherein: the upper pressure film plate is disposed above the lower pressure film plate and forms a film lifting channel; the upper pressure film plate moves vertically via an upper pressure lifting drive unit; the lower pressure film plate moves vertically via a lower pressure lifting drive unit; the film stretching component includes a film stretching frame, a film stretching linear drive component, a film stretching clamping drive component, and a film stretching clamping plate assembly, wherein: the film stretching linear drive component is disposed at the top of the film stretching frame, the film stretching clamping drive component is disposed at the push rod end of the film stretching linear drive component, and the film stretching clamping plate assembly is disposed on the film stretching clamping drive component and is joined or separated by the film stretching clamping drive component.

6. A cell-mount interlayer film unit according to claim 2, characterized in that: The film cutting unit includes a film cutting frame and a rotary cutter, wherein: the top of the film cutting frame is provided with a film cutting platform, and multiple film cutting grooves are arranged in parallel on the film cutting platform; the rotary cutter is placed in the film cutting groove, and its top extends out of the upper surface of the film cutting platform; the rotary cutter is rotated by a rotary drive unit and moves along the length direction of the film cutting groove by a cutter horizontal movement unit.

7. A cell-mount interlayer film unit according to claim 2, characterized in that: The film conveying unit includes a film strip cutting and conveying unit, a film strip temporary storage unit, and a film strip attaching and conveying unit. The film strip cutting and conveying unit has multiple sets of film cutting adsorption holes at its bottom, which are connected to a film cutting negative pressure supply unit. The film strip cutting and conveying unit moves horizontally via a horizontal film cutting conveying unit and vertically via a vertical film cutting conveying unit. The film strip temporary storage unit includes a film strip conveyor belt unit and a recycling frame, wherein the recycling frame is located at the end of the film strip conveyor belt unit. The film strip attaching and conveying unit has multiple film strip attaching adsorption holes at its bottom, which are connected to a film strip attaching negative pressure supply unit. The film strip attaching and conveying unit moves horizontally via a horizontal film strip attaching drive unit and vertically via a vertical film strip attaching drive unit.

8. A cell-mount interlayer film unit according to claim 5, characterized in that: The upper or lower pressure plate is provided with a film-pulling adsorption hole, which is connected to the film-pulling negative pressure supply unit.

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