Lithium battery automatic winding machine and intelligent winding control method thereof

Abstract

The invention relates to an automatic lithium battery winding machine and an intelligent winding control method thereof in the field of winding machines, and the automatic lithium battery winding machine comprises a mounting panel which is provided with a first diaphragm unwinding mechanism and a second diaphragm unwinding mechanism which are used for conveying diaphragms; the mounting panel is provided with a first pole piece unwinding mechanism and a second pole piece unwinding mechanism which are arranged on the mounting panel and used for conveying pole pieces, a winding mechanism used for winding diaphragms and the pole pieces, and a roll-in correction mechanism used for pre-winding the pole pieces and the diaphragms; according to the device, the diaphragms and the pole pieces are accurately centered and attached through the roll-in correction mechanism, displacement in the unwinding and conveying process is further reduced, meanwhile, by heating the diaphragms and the pole pieces, the softness and extension adhesion of the pole pieces and the diaphragms can be improved, the winding speed of the pole pieces is increased, and the winding speed of the pole pieces is increased. The tight attachment of the diaphragm and the pole piece winding is improved, and the production efficiency and quality are improved.

Description

Technical Field

[0001] The present invention relates to the field of winding machines, and in particular to an automatic winding machine for lithium batteries and an intelligent winding control method thereof. Background Art

[0002] As the core of modern energy storage technology, lithium batteries have a wide range of applications, including but not limited to new energy vehicles, portable electronic products and equipment, energy storage systems and other fields. As a key equipment in lithium battery production, the lithium battery automatic winding machine has a wide range of applications and its importance is becoming increasingly prominent. In the production process of lithium batteries, the winding machine undertakes the important task of winding positive and negative electrode sheets, diaphragms and other materials into lithium battery cells in a specific order. This process directly determines the structural quality of the battery cell and the overall performance of the battery. Therefore, the winding machine for lithium batteries occupies a pivotal position in the lithium battery industry chain.

[0003] The existing winding machine is mainly composed of a frame, a winding shaft, a tension control system, a transmission system, etc. Its working principle is to drive the winding shaft to rotate and wind the positive and negative electrodes and the diaphragm into a battery cell in a specific order and tension requirements. The tension control system is responsible for adjusting the tension of the material to ensure the stability and uniformity of the winding process. The transmission system transmits power through motors, reducers and other devices to drive the winding shaft to rotate. In addition, the winding machine is also equipped with various sensors and detection devices to monitor various parameters in the winding process in real time to ensure the winding quality.

[0004] However, although the existing lithium battery winding machines are relatively complete in structure and function, there are still some significant defects in practical applications. First, during the winding process, due to factors such as material tension fluctuations and equipment vibrations, the centering accuracy of the positive and negative electrodes and the diaphragm when entering the winding mechanism is difficult to ensure, resulting in uneven internal structure of the battery cell made by winding the diaphragm and the electrode, affecting the performance and safety of the battery cell. Secondly, during the winding process, if the tension is not properly controlled, the electrode may bend and deform. In addition, during the transmission and transportation of the existing electrode, the electrode and diaphragm repeatedly pass through the transmission mechanism and will be subjected to certain stretching and bending, thereby generating internal stress, making the stress uneven during the winding process, affecting the winding effect of the diaphragm and the electrode. In addition, the existing winding machine has a poor tight fitting effect on the winding of the electrode and the diaphragm, making it difficult to stably wind the electrode and the diaphragm, affecting the production efficiency and production quality of the automatic winding machine.

[0005] The winding process of the lithium battery automatic winding machine mainly includes the following steps: first, the positive and negative electrode sheets, separators and other raw materials are dusted and inspected, and then sent to the winding mechanism through the corresponding unwinding mechanism; secondly, the positive and negative electrode sheets and separators are arranged in the order of separator-positive electrode sheet-separator-negative electrode sheet and wound to form a battery cell structure through the winding mechanism; then, the electrode sheets and separators are accurately cut through the cutting mechanism; finally, the tail ends of the battery cell electrode sheets and separators are bonded using the gluing mechanism to complete the manufacture of the battery cell.

[0006] In the winding method of the existing lithium battery winding machine, the transportation of the pole piece and the diaphragm is generally provided with a correction and detection mechanism to perform the correction action, and then directly enters the winding mechanism to wind the battery cell. The winding and bonding effect of the battery cell still has certain defects, and it is not easy to make the pole piece and the diaphragm fit tightly, which affects the stable winding of the pole piece and the diaphragm in the winding mechanism. In addition, the existing pole piece and the diaphragm will be subjected to certain stretching and bending during the transmission through the conveying mechanism, and generate internal stress, which affects the winding effect of the pole piece and the diaphragm, and is not conducive to the automatic winding and production of the lithium battery winding machine. Summary of the invention

[0007] The purpose of the present invention is to solve the above defects and provide a lithium battery automatic winding machine and an intelligent winding control method thereof, so as to solve the technical problem that the tight fitting effect of the winding of the pole piece and the diaphragm in the above-mentioned background technology is poor, making it difficult to accurately and stably wind the pole piece and the diaphragm, affecting the production efficiency and production quality of the automatic winding machine battery cell winding.

[0008] The object of the present invention is achieved in the following ways:

[0009] The automatic winding machine for lithium batteries comprises an installation panel, on which a first membrane unwinding mechanism and a second membrane unwinding mechanism for conveying a membrane are arranged, and on which a first pole piece unwinding mechanism and a second pole piece unwinding mechanism for conveying a pole piece are arranged, and on which a winding mechanism for winding the membrane and the pole piece is arranged, and on which a winding correction mechanism for pre-winding the pole piece and the membrane is arranged on the installation panel, and the winding correction mechanism comprises a winding support seat, a winding correction cylinder, and two winding correction mechanisms. Roller and two in-roll deflection correction sensors, the two in-roll deflection correction rollers are symmetrically installed on both sides of the in-roll support seat, so that they are used to correct the in-roll pole piece, the telescopic end of the in-roll deflection correction cylinder extends to one end of the in-roll deflection correction roller, and a correction bracket for installing the in-roll deflection correction sensor is provided on the telescopic end of the in-roll deflection correction cylinder, and the two in-roll deflection correction sensors are symmetrically distributed at one end of the two in-roll deflection correction rollers, so that the in-roll deflection correction sensor can detect the position of the pole piece after it is corrected by the in-roll deflection correction roller under the drive of the in-roll deflection correction cylinder;

[0010] The winding support seat is provided with a heating air pipe for heating the diaphragm and the electrode piece, one end of the heating air pipe passes through the winding support seat and is used to introduce external heating gas through the mounting valve, and a plurality of conducting air outlet holes are opened on the heating air pipe, and the air outlet holes extend toward the outer surface of the electrode piece, so that the heating air pipe passes through the air outlet holes to heat the electrode piece and the diaphragm passing through the winding correction mechanism;

[0011] The first diaphragm unwinding mechanism and the second diaphragm unwinding mechanism are used to introduce the two diaphragms into the pre-wound winding correction mechanism respectively along the unwinding conveying direction, and the first electrode sheet unwinding mechanism and the second electrode sheet unwinding mechanism are used to introduce the positive and negative electrode sheets into the pre-wound winding correction mechanism respectively along the unwinding conveying direction, so that the winding correction mechanism is used to correct the two diaphragms and the positive and negative electrode sheets and then transport them into the winding mechanism for winding;

[0012] The unwinding and conveying direction of the first electrode sheet unwinding mechanism and the second electrode sheet unwinding mechanism is provided with a clamping and feeding mechanism for clamping and conveying the electrode sheet, and a electrode sheet cutting mechanism for cutting the electrode sheet is provided between the clamping and feeding mechanism and the winding correction mechanism, so that the winding mechanism winds the electrode sheet to a set length, is clamped by the clamping and feeding mechanism, cuts the electrode sheet through the electrode sheet cutting mechanism, and is reeled up by the winding mechanism, and a diaphragm cutting mechanism for cutting the diaphragm wound to a set length is provided on the installation panel, and a gluing mechanism is used on the installation panel to finish gluing the diaphragm and the electrode sheet to form a battery cell, so that the battery cell is unloaded through the unloading mechanism after gluing.

[0013] Further in the above description, a powder brushing component, a measuring component and a correcting component for respectively brushing powder, measuring and correcting the pole pieces are distributed in the direction in which the first pole piece unwinding mechanism and the second pole piece unwinding mechanism are conveyed toward the winding mechanism. The powder brushing component includes a brush and a dust box. The dust box is installed on the installation panel. The brush is arranged in the dust box. The outer surface of the brush is pressed and contacted with the outer surface of the pole piece, so that the pole piece is brushed and dusted along the outer surface of the brush during transportation.

[0014] Further in the above description, the heating air pipe is connected to the air inlet pipe through an installation valve, one end of the air inlet pipe is conductively connected to the heating box, an electric heating wire for heating the gas is provided in the heating box, and the heated air is evenly delivered into the heating air pipe through a heat-conducting fan in the heating box to heat the electrode and the diaphragm.

[0015] Further in the above description, the roll-in support seat is provided with a sheet-in guide roller for introducing the pole piece for transportation, and two sheet-in guide rollers are provided, and the two sheet-in guide rollers are symmetrically distributed on both sides of the roll-in support seat, so that the two sheet-in guide rollers are used to press the conveyed pole piece.

[0016] Further in the above description, the film clamping and feeding mechanism includes a film feeding clamping support, an upper roller seat of the film feeding clamp, a lower roller seat of the film feeding clamp and two film feeding plates. The mounting panel is connected to the film feeding clamping support through a moving rod. The upper roller seat of the film feeding clamp is installed on the film feeding clamping support. The lower roller seat of the film feeding clamp is installed on the film feeding clamping support through a driving cylinder. The telescopic end of the driving cylinder is connected to the lower roller seat of the film feeding clamp, and can drive the lower roller seat of the film feeding clamp to move toward the upper roller seat of the film feeding clamp. A clamping gap for clamping the electrode sheet is formed between the upper roller seat of the film feeding clamp and the lower roller seat of the film feeding clamp. Two film feeding plates are installed at one end of the film feeding clamping support close to the electrode sheet cutting mechanism.

[0017] In the above description, the mounting panel is provided with a first pressing mechanism and a second pressing mechanism for pressing and tensioning the pole piece and the diaphragm, the first pressing mechanism and the second pressing mechanism are distributed on both sides of the winding correction mechanism, the first pressing mechanism and the second pressing mechanism each include a mounting base, a sheet feeding pressure roller, a tensioning roller and a pressing roller, the mounting base is connected with a pressing cylinder through a moving part, the telescopic end of the pressing cylinder extends toward the winding correction mechanism and is connected to the pressing roller, the moving part is provided with a tensioning cylinder, and the tensioning roller The telescopic short tilt of the tightening cylinder extends toward the winding correction mechanism and is connected to the tensioning roller. The moving part is connected to the sheet feeding guide seat through a connecting plate, and the sheet feeding guide seat is connected to the low-pressure plate through a guide rod. A pressing portion is formed on the end of the pressure plate extending toward the winding correction mechanism. The sheet feeding pressure roller is installed on the end of the pressure plate close to the winding correction mechanism, so that when the pressure cylinder drives the moving part to move toward the winding correction mechanism, the sheet feeding pressure roller, the tensioning roller and the pressure roller move toward the winding correction mechanism and press the corresponding diaphragm and pole piece.

[0018] Further in the above description, a cavity is formed inside the pressure plate, and a cooling assembly is connected to the side of the pressure plate through a connecting valve, the cooling assembly includes a cooling box, a cooling pipe and a heat dissipation fan, one end of the cooling pipe is connected to the connecting valve, and the other end of the cooling pipe is connected to the cooling box, so that the heat dissipation fan is installed in the cooling box, and a cooling hole connected to the cavity is provided on the pressure plate, and the cooling hole extends through the pressure portion to the winding correction mechanism.

[0019] An intelligent winding method for a lithium battery automatic winding machine, the intelligent winding method comprising the following steps:

[0020] Step 1: Use a lithium battery automatic winding machine to wind the diaphragm and the electrode;

[0021] Step 2: Unwinding: the unwinding of the diaphragm and the electrode sheet is controlled by the diaphragm unwinding module and the electrode sheet unwinding module of the controller; the first diaphragm unwinding mechanism and the second diaphragm unwinding mechanism detect the two diaphragms through the ultrasonic detection mechanism in the unwinding conveying direction, so that they enter the pre-rolling winding correction mechanism respectively; the first electrode sheet unwinding mechanism and the second electrode sheet unwinding mechanism are used to convey the positive and negative electrode sheets to the winding correction mechanism respectively; the positive and negative electrode sheets pass through the powder brushing component, the measuring component and the deviation correction component in turn for powder brushing and dust removal, length measurement and deviation correction, and are conveyed to the clamping and feeding mechanism, and pass through the electrode sheet cutting mechanism under the clamping and feeding mechanism to enter the pre-rolling winding correction mechanism;

[0022] Step 3: Heating: the heating module of the controller controls the electric heating wire in the heating box to conduct heating, and the heated hot air is transported to the heating air pipe through the air inlet pipe by a heat-conducting fan, and the diaphragm and the pole piece passing through the winding correction mechanism are heated through the air outlet holes on the heating air pipe;

[0023] Step 4: Roll-in correction: the roll-in correction module of the controller controls the roll-in correction mechanism to guide the incoming diaphragm, positive electrode sheet, diaphragm and negative electrode sheet to roll in. When the diaphragm and electrode sheet are rolled to the set length, the electrode sheet cutting mechanism cuts the electrode sheet of the set length, and the positive electrode sheet and the negative electrode sheet are corrected by two roll-in correction rollers respectively. The roll-in correction cylinder drives the roll-in correction sensor on the correction bracket to correct the corrected positive electrode sheet and negative electrode sheet, and the diaphragm and electrode sheet are pressed by the first pressing mechanism and the second pressing mechanism, so that the diaphragm, positive electrode sheet, diaphragm and negative electrode sheet pass through the roll-in correction mechanism and enter the winding mechanism to form a precise fit. At the same time, the diaphragm and electrode sheet are cooled down through the cooling holes on the pressing plate;

[0024] Step 5: Winding: the winding module of the controller controls the winding mechanism to wind the separator, positive electrode sheet, separator, and negative electrode sheet after the correction of the winding, and the separator cutting mechanism is used to cut the wound separator;

[0025] Step 6: Gluing, the gluing module of the controller controls the gluing mechanism to glue and bond the diaphragm and the electrode, so that the two diaphragms and the positive and negative electrode sheets are wound to form a finished lithium battery cell;

[0026] Step 7: Unloading: the unloading module of the controller controls the unloading mechanism to unload the wound battery cell products.

[0027] Further in the above description, in the step three, a temperature sensor for real-time monitoring of the temperature of the winding area is installed in the heating box, and a cooling fan for cooling is provided in the heating box. The temperature of the hot air inside the heating box that passes through the air outlet is 70°C-85°C, so that the electrode and the diaphragm are fitted together.

[0028] Further in the above description, in step 4, the sheet feeding pressure roller, tensioning roller and pressure roller on the first pressure mechanism and the second pressure mechanism extend toward the winding correction mechanism so as to abut against the diaphragm and the pole piece.

[0029] Beneficial effects of the present invention:

[0030] 1. By setting the first and second diaphragm unwinding mechanisms and the first and second pole piece unwinding mechanisms, the diaphragms and pole pieces can be supplied synchronously and stably to ensure the continuity and stability of the production process. After the diaphragms and pole pieces are unwound and conveyed to the reel-in correction mechanism, the two reel-in correction rollers of the reel-in correction mechanism can accurately correct the reel-in pole piece, and the reel-in correction cylinder drives the reel-in correction sensor on the correction bracket to correct the pole piece corrected on the two reel-in correction rollers, as well as the precise guide correction of the diaphragm, and under the pressure of the first and second pole piece unwinding mechanisms on the diaphragm and pole piece, the diaphragm and the pole piece are aligned. The pole pieces are accurately aligned and fitted, which further reduces the displacement during the unwinding and transmission process, thereby effectively reducing the deviation of the diaphragm and the pole piece during the winding process, improving the winding accuracy and the consistency of the battery cell quality, and heating the pole piece and the diaphragm through the air outlet to further evenly release the internal stress of the diaphragm and the pole piece during the unwinding and transmission process, thereby reducing the internal stress caused by stretching and bending during the unwinding process. At the same time, by heating the diaphragm and the pole piece, it helps to improve the softness and ductility of the pole piece and the diaphragm, making the winding process after entering the winding mechanism smoother, improving the close fit of the diaphragm and the pole piece winding, and improving production efficiency and quality.

[0031] 2. In the intelligent winding method of lithium batteries, a heating module is used to control the heating treatment of step three. The hot air generated by the heating wire is transported to the heating air pipe through the heat conduction fan. The internal stress of the diaphragm and the pole piece can be evenly released during the unwinding and transmission process under the heating of the diaphragm and the pole piece, thereby reducing the internal stress generated by stretching and bending during the unwinding process. The air outlet holes distributed on the heating air pipe enable the hot air to directly act on the surface of the diaphragm and the pole piece, thereby uniformly heating the diaphragm and the pole piece. At the same time, the flexibility and adhesion of the material are improved, which is beneficial to the subsequent winding and bonding process. The winding correction mechanism of step four is controlled by the winding correction module to ensure that the diaphragm and the pole piece are accurately wound according to the predetermined path, and the winding correction roller corrects the wound pole piece, and the winding correction sensor cooperates to accurately correct the pole piece, further improving the winding accuracy and consistency, reducing the offset of the pole piece and the diaphragm entering the winding mechanism, and at the same time, the close fit between the diaphragm and the pole piece is ensured by the pressing mechanism, and then accurately and stably transported to the winding mechanism for subsequent winding action, thereby improving production quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a three-dimensional diagram of the overall structure of this embodiment;

[0033] Figure 2 It is a local structural plan view of this embodiment;

[0034] Figure 3 It is a three-dimensional diagram of the local structure of this embodiment;

[0035] Figure 4 This is a schematic diagram of the connection structure of the heating air pipe in this embodiment;

[0036] Figure 5 Schematic diagram of the structure of the roll-in correction mechanism in this embodiment;

[0037] Figure 6 Schematic diagram of the structure of the film clamping and feeding mechanism in this embodiment;

[0038] Figure 7 It is a schematic diagram of the structure of the first pressing mechanism and the second pressing mechanism in this embodiment;

[0039] Figure 8 Schematic diagram of the bottom view of the first pressing mechanism and the second pressing mechanism in this embodiment;

[0040] Fig. 9 It is a plan view of the first pressing mechanism and the second pressing mechanism in this embodiment;

[0041] Fig.10 Schematic diagram of the winding method in this embodiment;

[0042] The reference numerals in the figure are respectively: 1-installation panel, 2-first diaphragm unwinding mechanism, 3-second diaphragm unwinding mechanism, 4-first pole piece unwinding mechanism, 5-second pole piece unwinding mechanism, 6-winding mechanism, 7-heating air pipe, 8-installation valve, 9-air outlet, 10-pole piece cutting mechanism, 11-diaphragm cutting mechanism, 12-feeding mechanism, 13-powder brushing assembly, 14-measuring assembly, 15-correction assembly; 100-rolling correction mechanism, 101-rolling support seat, 102-rolling correction cylinder, 103-rolling correction roller, 104-rolling correction sensor, 105-correction bracket, 106-sheet feeding guide roller; 200-clamping and feeding mechanism, 201-sheet feeding clamping support, 202-sheet feeding clamp upper roller seat, 203-sheet feeding clamp lower roller seat, 204-sheet feeding plate, 205-driving cylinder;

[0043] 300a-first pressing mechanism, 300b-second pressing mechanism, 301-mounting base, 302-sheet feeding pressure roller, 303-tensioning roller, 304-pressing roller, 305-pressing cylinder, 306-tensioning cylinder, 307-connecting plate, 308-sheet feeding guide seat, 309-low pressure plate, 310-pressing part, 311-connecting valve. DETAILED DESCRIPTION

[0044] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0045] In this embodiment, refer to Figure 1-Figure 10 The lithium battery automatic winding machine specifically implemented includes an installation panel 1, on which a first diaphragm unwinding mechanism 2 and a second diaphragm unwinding mechanism 3 for conveying a diaphragm are provided, and a first pole piece unwinding mechanism 4 and a second pole piece unwinding mechanism 5 for conveying a pole piece are provided on the installation panel 1, and a winding mechanism 6 for winding the diaphragm and the pole piece is provided on the installation panel 1. The specific structure and operation principle of the unwinding of the pole piece and the diaphragm and the subsequent winding are well-known technologies that technicians in this field should know, so they will not be repeated here.

[0046] Reference Figure 2 and Figure 3 A powder brushing component 13, a measuring component 14 and a correcting component 15 for respectively brushing powder, measuring and correcting the pole pieces are distributed in the direction in which the first pole piece unwinding mechanism 4 and the second pole piece unwinding mechanism 5 are conveyed toward the winding mechanism 6. The powder brushing component 13 includes a brush and a dust box. The dust box is installed on the installation panel 1. The brush is arranged in the dust box, and the outer surface of the brush is pressed and contacted with the outer surface of the pole piece, so that the pole piece is brushed and dusted along the outer surface of the brush during transportation.

[0047] Specifically, after the pole piece is unwound, it is powdered, measured and corrected to further ensure the quality of the pole piece unwinding. Its specific structure and operation principle are well-known technologies that technicians in this field should know, so they will not be repeated here.

[0048] Reference Figure 4 and Figure 5 , the installation panel 1 is provided with a winding correction mechanism 100 for pre-winding the pole piece and the diaphragm, the winding correction mechanism 100 comprises a winding support seat 101, a winding correction sensing cylinder 102, two winding correction rollers 103 and two winding correction sensors 104, the two winding correction rollers 103 are symmetrically installed on both sides of the winding support seat 101, so that they are used to correct the winding pole piece, the telescopic end of the winding correction sensing cylinder 102 extends to one end of the winding correction roller 103, and a correction bracket 105 for installing the winding correction sensor 104 is provided on the telescopic end of the winding correction sensing cylinder 102, the two winding correction sensors 104 are symmetrically distributed at one end of the two winding correction rollers 103, so that the winding correction sensor 104 can detect the position of the pole piece after being corrected by the winding correction roller 103 under the drive of the winding correction sensing cylinder 102;

[0049] A sheet entry guide roller 106 for introducing the electrode sheet for transportation is arranged at the bottom of the winding support seat 101. Two sheet entry guide rollers 106 are arranged, and the two sheet entry guide rollers 106 are symmetrically distributed on both sides of the winding support seat 101, so that the two sheet entry guide rollers 106 are used to press the electrode sheet for transportation, and the sheet entry guide rollers 106 can guide and transport the introduced electrode sheet. The symmetrical arrangement of the sheet entry guide rollers 106 further ensures the accuracy of the transportation of the two electrode sheets, so that they can be accurately wound subsequently.

[0050] Reference Figure 4 The winding support seat 101 is provided with a heating air pipe 7 for heating the diaphragm and the electrode. One end of the heating air pipe 7 passes through the winding support seat 101 and is used to introduce external heating gas through the installation valve 8, and a plurality of conductive air outlet holes 9 are opened on the heating air pipe 7. The air outlet holes 9 extend to the outer surface of the electrode, so that the heating air pipe 7 is used to heat the electrode and the diaphragm passing through the winding correction mechanism 100 through the air outlet holes 9. The heating air pipe 7 is connected with an air inlet pipe through the installation valve 8, and one end of the air inlet pipe is conductively connected to a heating box (not shown). An electric heating wire (not shown) for heating gas is provided in the heating box. The heated air is evenly sent into the heating air pipe 7 through a heat-conducting fan (not shown) in the heating box to heat the electrode and the diaphragm.

[0051] Specifically, the hot air heated in the heating box is transported by a heat-conducting fan so that the air outlet 9 on the heating air pipe 7 performs regional heating on the diaphragm and the electrode piece, thereby allowing the internal stress of the diaphragm and the electrode piece to be evenly released during the unwinding process, thereby further reducing the phenomenon of poor subsequent winding quality and consistency due to uneven internal stress. Among them, the heating in this embodiment mainly acts on the heating of the diaphragm, and its operating principle is a well-known technology that technical personnel in this field should know, so it will not be repeated here.

[0052] The unwinding and conveying direction of the first electrode unwinding mechanism 4 and the second electrode unwinding mechanism 5 is provided with a clamping and feeding mechanism 200 for clamping and conveying the electrode, and a electrode cutting mechanism 10 for cutting the electrode is provided between the clamping and feeding mechanism 200 and the winding correction mechanism 100, so that the winding mechanism 6 winds the electrode to a set length, is clamped by the clamping and feeding mechanism 200, cuts the electrode through the electrode cutting mechanism 10, and is reeled by the winding mechanism 6, and a diaphragm cutting mechanism 11 for cutting the diaphragm wound to a set length is provided on the installation panel 1, and a gluing mechanism is used on the installation panel 1 to finish gluing the diaphragm and the electrode to form a battery cell, so that the battery cell is unloaded through the unloading mechanism 12 after gluing.

[0053] Reference Figure 2 , Figure 3 and Figure 6The film feeding mechanism 200 comprises a film feeding clamping support 201, an upper roller seat 202 for film feeding clamp, a lower roller seat 203 for film feeding clamp and two film feeding plates 204. The mounting panel 1 is connected to the film feeding clamping support 201 through a moving rod. The upper roller seat 202 for film feeding clamp is installed on the film feeding clamping support 201. The lower roller seat 203 for film feeding clamp is installed on the film feeding clamping support 201 through a driving cylinder 205. The telescopic end of the driving cylinder 205 is connected to the lower roller seat 203 for film feeding clamp and can drive the lower roller seat 203 for film feeding clamp to move toward the upper roller seat 202 for film feeding clamp. A clamping gap for clamping the electrode is formed between the upper roller seat 202 for film feeding clamp and the lower roller seat 203 for film feeding clamp. The two film feeding plates 204 are installed at one end of the film feeding clamping support 201 close to the electrode cutting mechanism 10.

[0054] After the electrode unwinding conveyor passes through the reel-in correction mechanism 100 and enters the winding mechanism 6, it is wound by the winding mechanism 6 to a set length, and the unwinding conveying end of the electrode is clamped by the upper roller seat 202 and the lower roller seat 203 of the clamping and feeding mechanism 200, and the electrode is clamped by the feeding plate 204. After the electrode is cut by the electrode cutting mechanism 10, the mobile module is used to drive the clamping and feeding mechanism 200 to feed the electrode to the reel-in correction mechanism 100 to carry out the next step of winding the electrode and the diaphragm, thereby repeating the action to complete the manufacture of the battery cell. The specific structure and operation principle of the clamping and feeding mechanism 200 are well-known technologies that should be known to those skilled in the art, so they will not be repeated here.

[0055] Reference Figure 7-Figure 9 The mounting panel 1 is provided with a first pressing mechanism 300a and a second pressing mechanism 300b for pressing and tensioning the pole piece and the diaphragm. The first pressing mechanism 300a and the second pressing mechanism 300b are distributed on both sides of the winding correction mechanism 100. The first pressing mechanism 300a and the second pressing mechanism 300b both include a mounting base 301, a sheet feeding pressure roller 302, a tensioning roller 303 and a pressing roller 304. The mounting base 301 is connected with a pressing cylinder 305 through a moving part. The telescopic end of the pressing cylinder 305 extends toward the winding correction mechanism 100 and is connected to the pressing roller 304. The moving part is provided with a tensioning cylinder 306. The telescopic short tilt of the cylinder 306 extends toward the winding correction mechanism 100 and is connected to the tensioning roller 303. The movable part is connected to the film entry guide seat 308 through a connecting plate 307. The film entry guide seat 308 is connected to the low-pressure plate 309 through a guide rod. A pressing portion 310 is formed on the end of the pressure plate extending toward the winding correction mechanism 100. The film entry pressure roller 302 is installed on the end of the pressure plate close to the winding correction mechanism 100, so that when the pressure cylinder 305 drives the movable part to move toward the winding correction mechanism 100, the film entry pressure roller 302, the tensioning roller 303 and the pressure roller 304 move toward the winding correction mechanism 100 and press the corresponding diaphragm and pole piece.

[0056] Specifically, the first pressing mechanism 300a and the second pressing mechanism 300b are symmetrically arranged, so that they can accurately press the pole piece and the diaphragm, further improving the fitting effect of the pole piece and the diaphragm, thereby enabling subsequent accurate winding.

[0057] A cavity is formed inside the pressure plate, and a cooling assembly (not shown) is connected to the side of the pressure plate through a connecting valve. The cooling assembly includes a cooling box, a cooling pipe and a heat dissipation fan. One end of the cooling pipe is connected to the connecting valve, and the other end of the cooling pipe is connected to the cooling box, so that the heat dissipation fan is installed in the cooling box. A cooling hole connected to the cavity is provided on the pressure plate. The cooling hole extends through the pressure portion 310 to the winding correction mechanism 100. The cooling assembly can cool the pressed diaphragm and pole piece through the cooling hole, thereby preventing the heating air pipe 7 from heating the diaphragm and pole piece to high temperature.

[0058] The specific use principle in this embodiment is:

[0059] The diaphragm and the electrode are supplied synchronously and stably through the first and second diaphragm unwinding mechanisms 3 and the first and second electrode unwinding mechanisms 5. After the electrode is brushed with powder and dust removed, the length is measured and the defects are detected along the unwinding conveying direction, the electrode enters the correction component 15 for correction, so that the electrode passes through the clamping and feeding mechanism 200 and the electrode cutting mechanism 10 to enter the winding correction mechanism 100 for secondary correction, and the electrode is conveyed along the sheet feeding guide roller 106 through the two winding correction rollers 103 to respectively perform accurate correction adjustment on one of the rolled electrode sheets. At the same time, the winding correction sensor 104 on the correction bracket 105 is driven by the winding correction cylinder 102 to correct the corrected electrode sheets on the two winding correction rollers 103, and the second diaphragm unwinding mechanism 3 conveys the diaphragm between the two electrode sheets, so that it passes through the winding correction mechanism 100 for accurate guidance and correction, so that the positive electrode sheet-diaphragm-negative electrode sheet are arranged in sequence;

[0060] The first diaphragm unwinding mechanism 2 guides the diaphragm from the side into the winding correction mechanism 100 for correction and correction, so that it forms a diaphragm-positive electrode sheet-diaphragm-negative electrode sheet in sequence. When passing through the winding correction mechanism 100, the external set stable hot air is introduced through the heating air pipe 7 and discharged from the air outlet 9, so as to heat the electrode sheet and the diaphragm, and further release the internal stress of the diaphragm and the electrode sheet during the unwinding and transmission process, thereby reducing the internal stress caused by stretching and bending during the unwinding process. At the same time, by heating the diaphragm and the electrode sheet, it is helpful to improve the electrode sheet and The softness and ductility of the diaphragm, as well as the pressure of the first and second electrode sheet unwinding mechanisms 5 on the diaphragm and electrode sheet, make the winding process of the diaphragm and electrode sheet after entering the winding mechanism 6 smoother, so that the diaphragm and electrode sheet can be accurately aligned and fitted, further reducing the displacement of the unwinding and transmission process, improving the winding accuracy and consistency of the battery cell quality, making the diaphragm and electrode sheet tightly fitted to form a battery cell, and rotating to the unloading position under the drive of the winding mechanism 6, and unloading the battery cell through the unloading mechanism 12, further improving production efficiency and quality.

[0061] The intelligent winding method of the lithium battery automatic winding machine in this embodiment comprises the following steps:

[0062] Step 1: Use a lithium battery automatic winding machine to wind the diaphragm and the electrode;

[0063] Step 2: Unwinding, the unwinding of the diaphragm and the electrode sheet is controlled by the diaphragm unwinding module and the electrode sheet unwinding module of the controller, the first diaphragm unwinding mechanism 2 and the second diaphragm unwinding mechanism 3 detect the two diaphragms through the ultrasonic detection mechanism in the unwinding conveying direction, so that they enter the pre-rolling winding correction mechanism 100 respectively, the first electrode sheet unwinding mechanism 4 and the second electrode sheet unwinding mechanism 5 are used to convey the positive and negative electrode sheets to the winding correction mechanism 100 respectively, the positive and negative electrode sheets pass through the powder brushing component 13, the measuring component 14 and the correction component 15 in turn for powder brushing and dust removal, length measurement and correction, and are conveyed to the clamping and feeding mechanism 200, pass through the clamping and feeding mechanism 200, pass through the electrode sheet cutting mechanism 10 and enter the pre-rolling winding correction mechanism 100;

[0064] Step 3: Heating. The heating module of the controller controls the electric heating wire in the heating box to conduct heating. The heated hot air is transported to the heating air pipe 7 through the air inlet pipe by a heat-conducting fan. The diaphragm and the pole piece passing through the winding correction mechanism 100 are heated through the air outlet 9 on the heating air pipe 7. A temperature sensor for real-time monitoring of the temperature of the winding area is installed in the heating box, and a cooling fan for cooling is provided in the heating box. The temperature of the hot air inside the heating box through the air outlet 9 is 80°C, so that the pole piece and the diaphragm are bonded.

[0065] Step 4: Correction of the winding deviation. The winding correction module of the controller controls the winding correction mechanism 100 to guide the incoming diaphragm, positive electrode sheet, diaphragm and negative electrode sheet. When the diaphragm and electrode sheet are wound to a set length, the electrode sheet cutting mechanism 10 cuts the electrode sheet of the set length. The positive electrode sheet and the negative electrode sheet are corrected by two winding correction rollers 103 respectively. The winding correction cylinder 102 drives the winding correction sensor 104 on the correction bracket 105 to correct the positive electrode sheet and the negative electrode sheet after correction. , and the diaphragm and the electrode sheet are pressed by the first pressing mechanism 300a and the second pressing mechanism 300b, so that the diaphragm, the positive electrode sheet, the diaphragm and the negative electrode sheet pass through the winding correction mechanism 100 to form a precise fit before entering the winding mechanism 6. At the same time, the diaphragm and the electrode sheet are cooled and lowered through the cooling holes on the pressing plate. The sheet feeding roller 302, the tensioning roller 303 and the pressing roller 304 on the first pressing mechanism 300a and the second pressing mechanism 300b extend toward the winding correction mechanism 100 to abut against the diaphragm and the electrode sheet;

[0066] Step 5: Winding: The winding module of the controller controls the winding mechanism 6 to wind the separator, positive electrode sheet, separator, and negative electrode sheet after the correction of the winding, and the separator cutting mechanism 11 is used to cut the wound separator;

[0067] Step 6: Gluing, the gluing module of the controller controls the gluing mechanism to glue and bond the diaphragm and the electrode, so that the two diaphragms and the positive and negative electrode sheets are wound to form a finished lithium battery cell;

[0068] Step 7: unloading: the unloading module of the controller controls the unloading mechanism 12 to unload the wound battery cell products.

[0069] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention is disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technician familiar with the profession can make some changes or modifications to equivalent embodiments of equivalent changes by using the technical contents disclosed above without departing from the scope of the technical solution of the present invention. However, any simple modification, equivalent changes and modifications made to the above embodiments according to the technology of the present invention are within the scope of the technical solution of the present invention without departing from the content of the technical solution of the present invention.

Claims

1. A lithium battery automatic winding machine, comprising a mounting panel, a first diaphragm unwinding mechanism and a second diaphragm unwinding mechanism for conveying a diaphragm are arranged on the mounting panel, and a first pole piece unwinding mechanism and a second pole piece unwinding mechanism for conveying a pole piece are arranged on the mounting panel, and a winding mechanism for winding the diaphragm and the pole piece is arranged on the mounting panel, characterized in that: The mounting panel is provided with a winding correction mechanism for pre-winding the pole piece and the diaphragm, the winding correction mechanism comprises a winding support seat, a winding correction sensing cylinder, two winding correction rollers and two winding correction sensors, the two winding correction rollers are symmetrically installed on both sides of the winding support seat, so that they are used to correct the winding pole piece, the telescopic end of the winding correction sensing cylinder extends to one end of the winding correction roller, and a correction bracket for installing the winding correction sensor is provided on the telescopic end of the winding correction cylinder, the two winding correction sensors are symmetrically distributed at one end of the two winding correction rollers, so that the winding correction sensor can detect the position of the pole piece after being corrected by the winding correction roller under the drive of the winding correction sensing cylinder; The winding support seat is provided with a heating air pipe for heating the diaphragm and the electrode piece, one end of the heating air pipe passes through the winding support seat and is used to introduce external heating gas through the mounting valve, and a plurality of conducting air outlet holes are opened on the heating air pipe, and the air outlet holes extend toward the outer surface of the electrode piece, so that the heating air pipe passes through the air outlet holes to heat the electrode piece and the diaphragm passing through the winding correction mechanism; The first diaphragm unwinding mechanism and the second diaphragm unwinding mechanism are used to introduce the two diaphragms into the pre-wound winding correction mechanism respectively along the unwinding conveying direction, and the first electrode sheet unwinding mechanism and the second electrode sheet unwinding mechanism are used to introduce the positive and negative electrode sheets into the pre-wound winding correction mechanism respectively along the unwinding conveying direction, so that the winding correction mechanism is used to correct the two diaphragms and the positive and negative electrode sheets and then transport them into the winding mechanism for winding; The unwinding and conveying direction of the first electrode sheet unwinding mechanism and the second electrode sheet unwinding mechanism is provided with a clamping and feeding mechanism for clamping and conveying the electrode sheet, and a electrode sheet cutting mechanism for cutting the electrode sheet is provided between the clamping and feeding mechanism and the winding correction mechanism, so that the winding mechanism winds the electrode sheet to a set length, is clamped by the clamping and feeding mechanism, cuts the electrode sheet through the electrode sheet cutting mechanism, and is reeled up by the winding mechanism, and a diaphragm cutting mechanism for cutting the diaphragm wound to a set length is provided on the installation panel, and a gluing mechanism is used on the installation panel to finish gluing the diaphragm and the electrode sheet to form a battery cell, so that the battery cell is unloaded through the unloading mechanism after gluing.

2. The automatic lithium battery winding machine according to claim 1, characterized in that: A powder brushing component, a measuring component and a correcting component for respectively brushing powder, measuring and correcting the pole pieces are distributed in the direction of conveyance of the first pole piece unwinding mechanism and the second pole piece unwinding mechanism toward the winding mechanism. The powder brushing component includes a brush and a dust box. The dust box is installed on the installation panel. The brush is arranged in the dust box. The outer surface of the brush is pressed and contacted with the outer surface of the pole piece, so that the pole piece is brushed with powder and dusted along the outer surface of the brush during conveyance.

3. The automatic lithium battery winding machine according to claim 2, characterized in that: The heating air pipe is connected to the air inlet pipe through an installation valve, one end of the air inlet pipe is conductively connected to the heating box, an electric heating wire for heating the gas is arranged in the heating box, and the heated air is evenly delivered into the heating air pipe through a heat-conducting fan in the heating box to heat the electrode and the diaphragm.

4. The automatic lithium battery winding machine according to claim 1, characterized in that: The roll-in support seat is provided with a sheet-in guide roller for introducing the pole piece for transportation. Two sheet-in guide rollers are provided, and the two sheet-in guide rollers are symmetrically distributed on both sides of the roll-in support seat, so that the two sheet-in guide rollers are used to press the transported pole piece.

5. The automatic lithium battery winding machine according to claim 1, characterized in that: The film feeding mechanism comprises a film feeding clamping support, an upper film feeding clamping roller seat, a lower film feeding clamping roller seat and two film feeding plates. The mounting panel is connected to the film feeding clamping support via a moving rod. The upper film feeding clamping roller seat is installed on the film feeding clamping support. The lower film feeding clamping roller seat is installed on the film feeding clamping support via a driving cylinder. The telescopic end of the driving cylinder is connected to the lower film feeding clamping roller seat, and can drive the lower film feeding clamping roller seat to move toward the upper film feeding clamping roller seat. A clamping gap for clamping the electrode sheet is formed between the upper film feeding clamping roller seat and the lower film feeding clamping roller seat. The two film feeding plates are installed at one end of the film feeding clamping support close to the electrode sheet cutting mechanism.

6. The automatic lithium battery winding machine according to claim 1, characterized in that: The first pressing mechanism and the second pressing mechanism are arranged on the mounting panel for pressing and tensioning the pole piece and the diaphragm, and the first pressing mechanism and the second pressing mechanism are distributed on both sides of the winding correction mechanism, and the first pressing mechanism and the second pressing mechanism both include a mounting base, a sheet feeding pressure roller, a tensioning roller and a pressing roller, and a pressing cylinder is connected to the mounting base through a moving part, and the telescopic end of the pressing cylinder extends toward the winding correction mechanism and is connected to the pressing roller, and the moving part is provided with a tensioning cylinder, and the telescopic short inclination of the tensioning cylinder extends toward the winding correction mechanism and is connected to the tensioning roller. The moving part is connected to a sheet feeding guide seat through a connecting plate, and the sheet feeding guide seat is connected to a low-pressure plate through a guide rod, and a pressing portion is formed at one end of the pressing plate extending toward the winding correction mechanism, and the sheet feeding pressure roller is installed at one end of the pressing plate close to the winding correction mechanism, so that when the pressing cylinder drives the moving part to move toward the winding correction mechanism, the sheet feeding pressure roller, the tensioning roller and the pressing roller move toward the winding correction mechanism and press the corresponding diaphragm and the pole piece.

7. The automatic lithium battery winding machine according to claim 6, characterized in that: A cavity is formed inside the pressure plate, and a cooling assembly is connected to the side of the pressure plate through a connecting valve. The cooling assembly includes a cooling box, a cooling pipe and a heat dissipation fan. One end of the cooling pipe is connected to the connecting valve, and the other end of the cooling pipe is connected to the cooling box, so that the heat dissipation fan is installed in the cooling box. A cooling hole connected to the cavity is provided on the pressure plate, and the cooling hole extends through the pressure portion to the winding correction mechanism.

8. An intelligent winding method for a lithium battery automatic winding machine, characterized in that: The smart winding method comprises the following steps: Step 1: Winding the separator and the electrode sheet using the lithium battery automatic winding machine according to any one of claims 1 to 7; Step 2: Unwinding: the unwinding of the diaphragm and the electrode sheet is controlled by the diaphragm unwinding module and the electrode sheet unwinding module of the controller; the first diaphragm unwinding mechanism and the second diaphragm unwinding mechanism detect the two diaphragms through the ultrasonic detection mechanism in the unwinding conveying direction, so that they enter the pre-rolling winding correction mechanism respectively; the first electrode sheet unwinding mechanism and the second electrode sheet unwinding mechanism are used to convey the positive and negative electrode sheets to the winding correction mechanism respectively; the positive and negative electrode sheets pass through the powder brushing component, the measuring component and the deviation correction component in turn for powder brushing and dust removal, length measurement and deviation correction, and are conveyed to the clamping and feeding mechanism, and pass through the electrode sheet cutting mechanism under the clamping and feeding mechanism to enter the pre-rolling winding correction mechanism; Step 3: Heating: the heating module of the controller controls the electric heating wire in the heating box to conduct heating, and the heated hot air is transported to the heating air pipe through the air inlet pipe by a heat-conducting fan, and the diaphragm and the pole piece passing through the winding correction mechanism are heated through the air outlet holes on the heating air pipe; Step 4: Roll-in correction: the roll-in correction module of the controller controls the roll-in correction mechanism to guide the incoming diaphragm, positive electrode sheet, diaphragm and negative electrode sheet to roll in. When the diaphragm and electrode sheet are rolled to the set length, the electrode sheet cutting mechanism cuts the electrode sheet of the set length, and the positive electrode sheet and the negative electrode sheet are corrected by two roll-in correction rollers respectively. The roll-in correction cylinder drives the roll-in correction sensor on the correction bracket to correct the corrected positive electrode sheet and negative electrode sheet, and the diaphragm and electrode sheet are pressed by the first pressing mechanism and the second pressing mechanism, so that the diaphragm, positive electrode sheet, diaphragm and negative electrode sheet pass through the roll-in correction mechanism and enter the winding mechanism to form a precise fit. At the same time, the diaphragm and electrode sheet are cooled down through the cooling holes on the pressing plate; Step 5: Winding: the winding module of the controller controls the winding mechanism to wind the separator, positive electrode sheet, separator, and negative electrode sheet after the correction of the winding, and the separator cutting mechanism is used to cut the wound separator; Step 6: Gluing, the gluing module of the controller controls the gluing mechanism to glue and bond the diaphragm and the electrode, so that the two diaphragms and the positive and negative electrode sheets are wound to form a finished lithium battery cell; Step 7: Unloading: the unloading module of the controller controls the unloading mechanism to unload the wound battery cell products.

9. The intelligent winding method of the lithium battery automatic winding machine according to claim 8, characterized in that: In the step three, a temperature sensor for real-time monitoring of the temperature of the winding area is installed in the heating box, and a cooling fan for cooling is provided in the heating box. The temperature of the hot air inside the heating box that passes through the air outlet is 70°C-85°C, so that the electrode and the diaphragm are fitted together.

10. The intelligent winding method of the lithium battery automatic winding machine according to claim 8, characterized in that: In the step 4, the sheet feeding pressing roller, the tensioning roller and the pressing roller on the first pressing mechanism and the second pressing mechanism extend toward the winding correction mechanism so as to abut against the diaphragm and the pole piece.

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