Sheet feeding mechanism with cut-off compensation assembly

Abstract

The utility model relates to a piece feeding mechanism with a cut-off compensation component, which comprises the cut-off compensation component and a piece feeding driving component, the cut-off compensation component and the piece feeding driving component are sequentially arranged between a cutter and a winding station along a pole piece belt running direction, and the piece feeding driving component conveys pole pieces to a winding needle of the winding station through a main driving roller. The cut-off compensation assembly comprises a compensation roller arranged on one side of the pole piece material belt, and when compensation is conducted before the pole piece material belt is cut off, the compensation roller pushes the pole piece material belt to the other side at a certain angle so as to change the length of the portion, between the cutter and the winding station, of the pole piece material belt. Before the pole piece material belt is cut off through the cutting compensation assembly, the length of the pole piece material belt between the cutter and the winding station is changed, pole pieces with inconsistent winding lengths caused by factors such as the thickness of the pole piece, the thickness of a diaphragm, the diameter of a winding needle and the like are compensated, and the cutting lengths of an inner pole piece and an outer pole piece are ensured to be consistent; and the cell quality of the double-cell winding machine is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to lithium battery winding equipment technical field, especially in a kind of piece feeding mechanism with cutting compensation component. BACKGROUND

[0002] In order to improve the production efficiency of lithium battery winding, double winding station winding machine appears, can simultaneously wind inside and outside two electric cores on winding needle, double winding station is in winding process, because the tension of inside and outside two pole piece material belt, diaphragm material belt is difficult to be completely synchronous when winding, make the thickness of inside electric core, outside electric core and diaphragm thickness of respective pole piece have difference, lead to the diameter size of inside electric core, outside electric core appears difference, so that inside pole piece, outside pole piece need to cut off the position of tail end is inconsistent, and the cutting position of inside pole piece, outside pole piece is fixed, leading to the length of inside pole piece, outside pole piece that tail end winding is respectively in inside electric core, inside electric core is inconsistent, thereby affecting electric core quality and consistency. SUMMARY

[0003] In order to solve the insufficient of prior art, the utility model provides a kind of piece feeding mechanism with cutting compensation component.

[0004] The utility model provides a kind of piece feeding mechanism with cutting compensation component, including cutting compensation component, piece feeding drive component, the cutting compensation component, piece feeding drive component is sequentially arranged between cutting tool and winding station along the direction of pole piece material belt, the piece feeding drive component is conveyed pole piece to the winding needle of winding station by main drive roll, the cutting compensation component includes the compensation roll of being arranged in one side of pole piece material belt, when compensating before pole piece material belt cutting, the compensation roll with pole piece material belt is pushed to another side at certain angle, to change the length of pole piece material belt between cutting tool and winding station.

[0005] In some embodiments, it also includes fixed roll, the fixed roll is arranged between cutting compensation component and cutting tool, the fixed roll and main drive roll form compensation station, when compensating before pole piece material belt cutting, the compensation roll moves relative to fixed roll, main drive roll, to push pole piece material belt between fixed roll and main drive roll.

[0006] In some embodiments, when pole piece material belt does not compensate, the pole piece material belt of compensation station is straight line, when compensating before pole piece cutting, the pole piece material belt of compensation station is bent into C type.

[0007] In some embodiments, the fixed roller is mounted on one side of a first movable plate, the first movable plate is movably mounted below a connecting plate and connected with the cutting compensation assembly, a first guide rail is arranged between the first movable plate and the connecting plate, a downward pressing cylinder is arranged between the connecting plate and the first movable plate, and the downward pressing cylinder drives the first movable plate and the fixed roller to move along the first guide rail to press or release the pole piece tape.

[0008] In some embodiments, the cutting compensation assembly comprises a compensation roller, a second movable plate, a second guide rail and a linear drive module, the compensation roller is mounted on one side of the second movable plate, the second movable plate is arranged in parallel on one side of the first movable plate, the second guide rail and the linear drive module are arranged in parallel between the second movable plate and the first movable plate, the second guide rail is parallel to the first guide rail, and the linear drive module drives the second movable plate and the compensation roller to move along the second guide rail.

[0009] In some embodiments, the sheet feeding mechanism is divided into an inner sheet feeding mechanism and an outer sheet feeding mechanism, the inner sheet feeding mechanism and the outer sheet feeding mechanism each comprise a fixed roller, a cutting compensation assembly and a sheet feeding drive assembly, the inner sheet feeding mechanism and the outer sheet feeding mechanism synchronously feed the inner pole piece and the outer pole piece to the winding needle of the winding work station respectively, the inner sheet feeding mechanism and the outer sheet feeding mechanism are arranged on a support together, a third guide rail is arranged between the connecting plate of the inner sheet feeding mechanism and the support, the third guide rail is perpendicular to the first guide rail, the first movable plate of the inner sheet feeding mechanism is provided with a linkage cylinder in transmission connection with the sheet feeding drive assembly of the inner sheet feeding mechanism, and the sheet feeding drive assembly of the inner sheet feeding mechanism drives the fixed roller and the compensation roller of the inner sheet feeding mechanism to move along the third guide rail through the linkage cylinder; and the connecting plate of the outer sheet feeding mechanism is fixed to the support.

[0010] In some embodiments, the linkage cylinder is vertically arranged below the first movable plate of the inner sheet feeding mechanism, a butt joint is arranged on the driving end of the linkage cylinder, and the butt joint cooperates with a deviation rectifying plate of the sheet feeding drive assembly of the inner sheet feeding mechanism.

[0011] In some embodiments, the sheet feeding drive assembly comprises a main drive roller, a deviation rectifying plate, a deviation rectifying drive module and a sheet feeding drive piece, the main drive roller and the sheet feeding drive piece are arranged on the deviation rectifying plate, the sheet feeding drive piece is in transmission connection with the main drive roller to drive the main drive roller to rotate, a fourth guide rail is arranged between the deviation rectifying plate and the support, the deviation rectifying drive module is arranged between the deviation rectifying plate and the support, and the deviation rectifying drive module drives the deviation rectifying plate and the main drive roller to move along the fourth guide rail.

[0012] In some embodiments, an entering sheet guiding assembly is further included, which is installed on the support and below the outer entering sheet mechanism, and includes a fixed rod, a swing arm, a blowing rod and an entering sheet guiding cylinder, the fixed rod and the entering sheet guiding cylinder are connected with the support, the swing arm is connected with the fixed rod and is in transmission connection with the entering sheet guiding cylinder, the blowing rod of an external air source is installed on the swing arm, the entering sheet guiding cylinder drives the swing arm and the blowing rod to swing around the fixed rod, and a detection assembly is arranged on the swing arm to detect the position of the sheet material and the number of tabs.

[0013] In some embodiments, a guiding adsorption plate is arranged on the swing arm, and a gas hole of an external air source is arranged on the guiding adsorption plate, and the gas hole forms a negative pressure for adsorbing the sheet material through the external air source.

[0014] Compared with the prior art, the utility model has the beneficial effects that: through cutting off the compensation assembly before cutting off the sheet material, the length of the sheet material between the cutting knife and the winding station is changed, the sheet material with inconsistent winding length caused by factors such as sheet thickness, diaphragm thickness and needle diameter is compensated, the sheet material at the cutting knife is a cutting position meeting the length requirement, the length consistency of the inner sheet and the outer sheet is ensured, and the quality of the double-cell winding machine is improved. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 It is a plane structure schematic view of the entering sheet mechanism with the cutting compensation assembly of the embodiment of the application conveying the left and right sheet materials to the winding station.

[0016] Figure 2 It is a position relationship structure schematic view between the left and right sheet materials and the compensation roller of the embodiment of the application.

[0017] Figure 3 It is a three-dimensional structure schematic view of the entering sheet mechanism with the cutting compensation assembly of the embodiment of the application.

[0018] Figure 4 It is a plane structure schematic view of the entering sheet mechanism with the cutting compensation assembly of the left sheet side of the embodiment of the application.

[0019] Figure 5 It is a plane structure schematic view of the entering sheet mechanism with the cutting compensation assembly of the right sheet side of the embodiment of the application.

[0020] Figure 6 It is one of the three-dimensional structure schematic views of the cutting compensation assembly of the embodiment of the application.

[0021] Figure 7 It is the second three-dimensional structure schematic view of the cutting compensation assembly of the embodiment of the application.

[0022] Figure 8 is a sectional structure schematic view of the cutting compensation assembly of the embodiment of the present application.

[0023] Figure 9 is one of the perspective structure schematic views of the sheet feeding driving assembly of the embodiment of the present application.

[0024] Figure 10 is the second perspective structure schematic view of the sheet feeding driving assembly of the embodiment of the present application.

[0025] Reference signs: 101, left pole piece; 102, right pole piece; 103, first diaphragm; 104, second diaphragm; 105, pole piece material strip;

[0026] 201, winding station; 202, blanking station; 203, compensation station;

[0027] 1, inner sheet feeding mechanism;

[0028] 2, outer sheet feeding mechanism;

[0029] 3, fixed roller; 31, first movable plate; 32, connecting plate; 33, first guide rail; 34, downward pressing air cylinder;

[0030] 4, cutting compensation assembly; 41, compensation roller; 42, second movable plate; 43, second guide rail; 44, linear driving module;

[0031] 5, linkage air cylinder; 51, butt joint; 52, third guide rail; 53, homing spring;

[0032] 6, sheet feeding driving assembly; 61, main driving roller; 62, deviation rectifying plate; 63, deviation rectifying driving module; 64, sheet feeding driving piece; 65, fourth guide rail; 66, butt joint groove;

[0033] 7, support; 71, upper support plate; 72, lower support plate; 73, support plate;

[0034] 8, sheet feeding guiding assembly; 81, fixed rod; 82, swing arm; 83, air blowing rod; 84, sheet feeding guiding air cylinder; 85, guiding and adsorbing plate;

[0035] 9, detection assembly; 91, first sensor; 92, second sensor. DETAILED DESCRIPTION

[0036] The specific implementation manners of the present application are described with reference to the drawings.

[0037] Reference Figure 1, Fig. 2 is a schematic view of the planar structure of the sheet feeding mechanism with the cutting compensation assembly conveying the left and right sheet material tapes to the winding station 201, and the lower part of the figure is the winding station 201 and the discharging station 202, and the winding needle is switched between the winding station 201 and the discharging station 202, and the left sheet 101, the first diaphragm 103, the right sheet 102 and the second diaphragm 104 are sequentially wound into the battery cell at the winding station 201, and the left sheet 101 and the right sheet 102 are respectively fed to the winding station 201 by one sheet feeding mechanism with the cutting compensation assembly, and the winding station 201 simultaneously winds the inner battery cell and the outer battery cell. Among them, the names of the left sheet 101 and the right sheet 102 are to distinguish the purposes of the two sheet feeding mechanisms with the cutting compensation assembly, and in practice, the left sheet 101 and the right sheet 102 can be negative sheets and positive sheets or positive sheets and negative sheets, and each sheet feeding mechanism with the cutting compensation assembly simultaneously conveys the inner sheet and the outer sheet, and the names of the inner sheet and the outer sheet are to distinguish the inner sheet and the outer sheet in the same sheet feeding mechanism with the cutting compensation assembly, and the inner sheet and the outer sheet conveyed on the same sheet feeding mechanism with the cutting compensation assembly are negative sheets or positive sheets.

[0038] Reference Figures 1 to 10 A sheet feeding mechanism with a cutting compensation assembly, comprising a cutting compensation assembly 4 and a sheet feeding driving assembly 6, the cutting compensation assembly 4 and the sheet feeding driving assembly 6 are sequentially arranged between the cutting knife and the winding station 201 along the sheet tape direction, the sheet feeding driving assembly 6 conveys the sheet to the winding needle of the winding station 201 through the main driving roller 61, the cutting compensation assembly 4 comprises a compensation roller 41 arranged on one side of the sheet material tape 105, and when compensation is performed before the sheet material tape 105 is cut, the compensation roller 41 pushes the sheet material tape 105 to the other side at a certain angle to change the length of the sheet material tape 105 between the cutting knife and the winding station 201.

[0039] The sheet feeding mechanism with the cutting compensation assembly of the embodiment of the application changes the length of the sheet material tape 105 between the cutting knife and the winding station 201 by the cutting compensation assembly 4 before cutting the sheet material tape 105, compensates the sheets with inconsistent winding lengths caused by factors such as sheet thickness, diaphragm thickness and winding needle diameter, makes the sheet material tape 105 at the cutting knife be a cutting position meeting the length requirement, ensures the length consistency of the inner sheet and the outer sheet, and improves the battery cell quality of the double-battery-cell winding machine.

[0040] It needs to be further explained that the sheet feeding mechanism with the cutting compensation assembly in the embodiment is provided with a cutting knife and a feeding mechanism behind the polar sheet running direction. The cutting knife is arranged close to the fixed roller 3. The positions of the feeding mechanism and the cutting knife are similar to the feeding structure and the polar sheet cutting structure disclosed in the invention patent in the application No. CN202410071628.4, a super-small and super-short polar sheet cylindrical lithium battery cell sheet feeding traction cutting and winding mechanism. The feeding mechanism clamps and drags the head of the cut polar sheet material belt 105 to the sheet feeding driving assembly 6 with a clamp plate. The clamp plate of the feeding mechanism retreats to clamp the next section of the polar sheet material belt 105 at the cutting knife. The pair of main driving rollers 61 of the sheet feeding driving assembly 6 feeds the polar sheet material belt 105 to the winding needle of the winding station 201. When the winding needle continuously winds for a period of time and is about to end, according to the detected length of the polar sheet wound by the winding needle, the length difference between the inner polar sheet and the outer polar sheet is determined, and then the compensation roller 41 is controlled to push the polar sheet material belt 105 by a corresponding length. After adjusting the length of the polar sheet material belt 105 between the cutting knife and the winding station 201, the cutting knife cuts the polar sheet material belt 105.

[0041] In order to guide the polar sheet material belt 105, in the embodiment, referring to Figures 1 to 8 The sheet feeding mechanism further comprises a fixed roller 3 arranged between the cutting compensation assembly 4 and the cutting knife. The fixed roller 3 and the main driving roller 61 form a compensation station 203. When compensating before cutting the polar sheet material belt 105, the compensation roller 41 moves relative to the fixed roller 3 and the main driving roller 61 to push the polar sheet material belt 105 between the fixed roller 3 and the main driving roller 61.

[0042] It can be understood that in this way, the fixed roller 3 and the compensation roller 41 are respectively located on both sides of the polar sheet material belt 105. The compensation roller 41 is located in the compensation station 203 and performs compensation operation on the polar sheet material belt 105 passing through the compensation station 203. The main driving roller 61 is arranged in pairs and clamps the polar sheet material belt 105. The compensation roller 41 vertically pushes the polar sheet material belt 105, so that the compensation roller 41 pulls a certain length of the polar sheet material belt 105 behind the fixed roller 3, so that the polar sheet material belt 105 between the cutting knife and the winding station 201 can be compensated by a certain length, so that the polar sheet material belt 105 reaches the specified length.

[0043] In order to avoid the influence of the compensation roller 41 on the conveying of the polar sheet material belt 105, in the embodiment, referring to Figure 8 When the polar sheet material belt 105 is not compensated, the polar sheet material belt 105 in the compensation station 203 is straight. When the polar sheet is cut before compensation, the polar sheet material belt 105 in the compensation station 203 is bent into a C shape.

[0044] It can be understood that, in this way, during high-speed winding in the winding station 201, the speed of the pole strip needs to be fast, and in this process, the compensation roller 41 will retreat to a position not in contact with the pole strip material belt 105, avoiding the influence of the compensation roller 41 on the pole strip, so that the pole strip material belt 105 between the fixed roller 3, the main drive roller 61 and the winding station 201 is in a straight line, which can ensure that the pole strip can have sufficient speed for walking. When the pole strip material belt 105 needs to be cut off, the winding needle speed of the winding station 201 will be reduced, and the walking speed of the pole strip will also be reduced. Only then will the compensation roller 41 contact the pole strip material belt 105 and push the pole strip material belt 105 to form a C-shaped type. After the cutter cuts, the compensation roller 41 needs to retreat so that the feeding mechanism can transport the next section of the pole strip material belt 105 to the main drive roller 61.

[0045] In order to drive the fixed roller 3 to move, in the embodiment, referring to Figures 6 to 8 , the fixed roller 3 is installed on one side of the first movable plate 31, the first movable plate 31 is movably installed below the connecting plate 32 and connected with the cutting compensation assembly 4, and the first guide rail 33 is arranged between the first movable plate 31 and the connecting plate 32. The down pressure cylinder 34 drives the first movable plate 31 and the fixed roller 3 to move along the first guide rail 33, so as to drive the fixed roller 3 to press or loosen the pole strip material belt 105.

[0046] It can be understood that, in this way, the down pressure cylinder 34 drives the fixed roller 3 to move along the first guide rail 33, and when the pole strip material belt 105 is compensated, the fixed roller 3 presses the pole strip material belt 105 through the down pressure cylinder 34 to fix the path of the pole strip material belt 105, so as to facilitate the compensation roller 41 to accurately control the compensation amount of the pole strip material belt 105.

[0047] In order to change the length of the pole strip material belt 105 between the cutter and the winding station 201, in the embodiment, referring to Figures 6 to 8 , the cutting compensation assembly 4 includes a compensation roller 41, a second movable plate 42, a second guide rail 43 and a linear drive module 44. The compensation roller 41 is installed on one side of the second movable plate 42, and the second movable plate 42 is arranged parallel to one side of the first movable plate 31. The second guide rail 43 and the linear drive module 44 are arranged parallel to each other between the second movable plate 42 and the first movable plate 31. The second guide rail 43 is parallel to the first guide rail 33, and the linear drive module 44 drives the second movable plate 42 and the compensation roller 41 to move along the second guide rail 43.

[0048] It can be understood that, thus arranged, by adding the cutting compensation assembly 4 to the sheet feeding mechanism, changing the length of the pole piece material belt 105 between the cutting knife and the winding station 201 before cutting, driving the compensation roller 41 to move linearly along the second guide rail 43 by the linear drive module 44 composed of a motor and a transmission screw pair, the inconsistent cutting positions of the inner and outer pole pieces caused by the thickness of the pole piece, the thickness of the diaphragm, and the diameter of the winding needle during the winding of the double battery core are adjusted to consistent cutting positions, and then the inner and outer pole pieces are cut synchronously, effectively ensuring the quality of the battery core.

[0049] In order to simultaneously feed the inner and outer pole pieces to the winding station 201, in the embodiment, referring to Figures 3 to 10 , the sheet feeding mechanism is divided into an inner sheet feeding mechanism 1 and an outer sheet feeding mechanism 2, both the inner sheet feeding mechanism 1 and the outer sheet feeding mechanism 2 include a fixed roller 3, a cutting compensation assembly 4, and a sheet feeding driving assembly 6, the inner sheet feeding mechanism 1 and the outer sheet feeding mechanism 2 respectively feed the inner and outer pole pieces to the winding needle of the winding station 201 synchronously, the inner sheet feeding mechanism 1 and the outer sheet feeding mechanism 2 are arranged together on a support 7, a third guide rail 52 is arranged between the connecting plate 32 of the inner sheet feeding mechanism 1 and the support 7, the third guide rail 52 is perpendicular to the first guide rail 33, the first movable plate 31 of the inner sheet feeding mechanism 1 is provided with a linkage cylinder 5 in transmission connection with the sheet feeding driving assembly 6 of the inner sheet feeding mechanism 1, and the sheet feeding driving assembly 6 of the inner sheet feeding mechanism 1 drives the fixed roller 3 and the compensation roller 41 of the inner sheet feeding mechanism 1 to move along the third guide rail 52 through the linkage cylinder 5; the connecting plate 32 of the outer sheet feeding mechanism 2 is fixed to the support 7.

[0050] It can be understood that, thus arranged, the third guide rail 52 is arranged along the width direction of the pole piece material belt 105, the first guide rail 33 and the second guide rail 43 are both arranged perpendicularly to the pole piece material belt 105, the inner and outer pole pieces are simultaneously fed to the winding needle of the winding station 201 by the inner sheet feeding mechanism 1 and the outer sheet feeding mechanism 2, the pole piece material belt 105 is fed to the winding needle by the sheet feeding driving assembly 6 and is rectified during the feeding process, the inner pole piece is close to the large plate of the winding machine, and the rectification difficulty of the inner pole piece is greater than that of the outer pole piece, so the rectification strength is greater, the sheet feeding driving assembly 6 of the inner sheet feeding mechanism 1 is linked with the cutting compensation assembly 4 of the inner sheet feeding mechanism 1 by the linkage cylinder 5, the inner pole piece is not torn during the compensation process, the folding of the inner pole piece during the winding process is effectively avoided, and the quality of the battery core is ensured.

[0051] In order to link the sheet feeding driving assembly 6 of the inner sheet feeding mechanism 1 with the cutting compensation assembly 4, in the embodiment, referring to Figures 6 to 10 , the linkage cylinder 5 is arranged vertically below the first movable plate 31 of the inner sheet feeding mechanism 1, the driving end of the linkage cylinder 5 is provided with a butt joint 51, and the butt joint 51 cooperates with the rectification plate 62 of the sheet feeding driving assembly 6 of the inner sheet feeding mechanism 1.

[0052] It should be further explained that two homing springs 53 are arranged between the connecting plate 32 of the inner sheet feeding mechanism 1 and the support 7, and the homing springs 53 are tension springs, which help the fixing roller 3 and the compensation roller 41 to quickly return to the center point, and ensure that the actions of the fixing roller 3, the compensation roller 41 and the main driving roller 61 of the inner sheet feeding mechanism 1 are consistent when the main driving roller 61 is deviated in the width direction of the polar sheet material belt 105.

[0053] It can be understood that, in this way, the linkage cylinder 5 is vertically arranged below the first movable plate 31, the driving end of the linkage cylinder 5 is arranged towards the sheet feeding driving assembly 6, the deviation plate 62 of the sheet feeding driving assembly 6 is arranged with the butt joint groove 66, and the butt joint 51 is inserted into the butt joint groove 66, so that the linkage of the sheet feeding driving assembly 6 of the inner sheet feeding mechanism 1 and the cutting and compensation assembly 4 is completed.

[0054] In order to convey the polar sheet material belt 105 to the winding station 201, in the embodiment, referring to Figure 9 and Figure 10 , the sheet feeding driving assembly 6 comprises a main driving roller 61, a deviation plate 62, a deviation driving module 63 and a sheet feeding driving member 64, the main driving roller 61 and the sheet feeding driving member 64 are arranged on the deviation plate 62, the sheet feeding driving member 64 is in transmission connection with the main driving roller 61 to drive the main driving roller 61 to rotate, the fourth guide rail 65 is arranged between the deviation plate 62 and the support 7, the deviation driving module 63 is arranged between the deviation plate 62 and the support 7, and the deviation driving module 63 drives the deviation plate 62 and the main driving roller 61 to move along the fourth guide rail 65.

[0055] It should be further explained that the support 7 comprises an upper support plate 71 and a lower support plate 72, the cutting and compensation assembly 4 and the fixing roller 3 are installed on the upper support plate 71, the sheet feeding driving assembly 6 is installed on the lower support plate 72, and the upper support plate 71 and the lower support plate 72 are fixed by the support plate 73. The sheet feeding driving assembly 6 of the inner sheet feeding mechanism 1 and the sheet feeding driving assembly 6 of the outer sheet feeding mechanism 2 are respectively arranged on the upper and lower sides of the lower support plate 72.

[0056] It can be understood that, in this way, the pair of main driving rollers 61 clamps the polar sheet material belt 105, the sheet feeding driving member 64 is a driving motor, the sheet feeding driving member 64 drives the main driving roller 61 to rotate, so as to convey the polar sheet material belt 105 to the winding station 201, the sheet feeding driving member 64 and the main driving roller 61 are arranged on the deviation plate 62, the deviation driving module 63 is composed of a deviation motor and a deviation screw rod pair, the deviation motor and the fourth guide rail 65 are installed on the lower support plate 72, the deviation screw rod pair is arranged between the deviation plate 62 and the deviation motor, the fourth guide rail 65 is arranged in the width direction of the polar sheet material belt 105, and the deviation driving module 63 drives the deviation plate 62 and the main driving roller 61 to move along the fourth guide rail 65, so as to realize the deviation of the polar sheet material belt 105.

[0057] It needs to be further explained that before the pole piece tape 105 is cut off, according to the length difference value of the inner and outer pole pieces fed back by the relevant pole piece length detection structure, the path of the fixed roller 3 is pressed to fix the pole piece tape 105, then the compensation roller 41 of the cutting compensation assembly 4 is extended, the length of the pole piece tape 105 between the main drive roller 61 and the fixed roller 3 is changed, so that the cutting positions of the inner and outer pole pieces are equal, and then the inner and outer pole pieces are cut off synchronously.

[0058] In order to stably feed the head of the pole piece tape 105 into the winding needle of the winding station 201, in the embodiment, referring to Figure 9 and Figure 10 , the sheet feeding mechanism further comprises a sheet feeding guide assembly 8 installed at the lower support plate 72 of the support 7 and located below the outer sheet feeding mechanism 2. The sheet feeding guide assembly 8 comprises a fixed rod 81, a swing arm 82, a blowing rod 83 and a sheet feeding guide cylinder 84. The fixed rod 81 and the sheet feeding guide cylinder 84 are connected with the support 7. The swing arm 82 is connected with the fixed rod 81 and is in transmission connection with the sheet feeding guide cylinder 84. The blowing rod 83 connected with an external air source is installed on the swing arm 82. The sheet feeding guide cylinder 84 drives the swing arm 82 and the blowing rod 83 to swing around the fixed rod 81. The swing arm 82 is provided with a detection assembly 9 for detecting the position of the pole piece tape 105 and the number of tabs.

[0059] It can be understood that in this way, the main drive roller 61 clamps the pole piece tape 105, and the rotating main drive roller 61 conveys the pole piece tape 105 to the winding station 201. The sheet feeding guide cylinder 84 drives the swing arm 82 and the blowing rod 83 to swing, so that the swing arm 82 holds the head of the pole piece tape 105, and the blowing rod 83 blows air to the winding station 201, so that the head of the pole piece tape 105 is blown to the winding station 201, thereby guiding the pole piece tape 105 into the winding needle of the winding station 201, and the pole piece tape 105 is pre-wound with the diaphragm through the winding needle.

[0060] In order to improve the quality of the wound battery cell, in the embodiment, referring to Figure 9 and Figure 10 , the swing arm 82 is provided with a guide adsorption plate 85, and the guide adsorption plate 85 is provided with air holes connected with an external air source, and the air holes form a negative pressure adsorbing the pole piece through the external air source.

[0061] It can be understood that in this way, after the pole piece tape 105 is cut off, the tail of the pole piece tape 105 is free from the main drive roller 61 and is prone to displacement. Therefore, the guide adsorption plate 85 is swung below the pole piece tape 105 before the pole piece tape 105 is cut off, the tail of the pole piece tape 105 is adsorbed by the negative pressure, the pole piece tape 105 is provided with tension, the alignment of the tail of the pole piece tape 105 is ensured, and the production yield and the quality of the battery cell are effectively improved.

[0062] It needs to be further explained that the detection assembly 9 is divided into a first sensor 91 for detecting the position of the tab material belt 105 and a second sensor 92 for detecting the number and position of the tabs, and the deviation correction driving module 63 drives the deviation correction plate 62 and the main driving roller 61 to move according to the position data of the tab material belt 105 detected by the first sensor 91, so as to correct the tab material belt 105, and the number and position of the passing tabs are detected by the second sensor 92 to determine whether the tabs are folded.

[0063] The working process of the embodiment of the application is as follows: after the winding needle of the winding station 201 is changed to the discharging station 202, the feeding mechanism clamps the head of the tab material belt 105 and drags it to the main driving roller 61, the head of the tab material belt 105 is clamped by the pair of main driving rollers 61, the tab material belt 105 is transported to the winding station 201 by the main driving roller 61, the head of the tab material belt 105 is blown by the air blowing rod 83 of the tab guiding assembly 8 and guided into the winding needle, and the tab pre-winding is synchronized with the winding needle; in the process that the main driving roller 61 continuously transports the tab material belt 105 to the winding station 201, the position of the tab material belt 105 is detected in real time by the detection assembly 9, and the tab material belt 105 is corrected by the deviation correction driving module 63; before the winding is completed and before the tab material belt 105 is cut off, the guiding adsorption plate 85 is swung below the tab material belt 105 by the tab guiding cylinder 84, the vacuum is opened, the tail of the tab material belt 105 is adsorbed, the tension of the tab material belt 105 is provided, and the alignment of the tail of the tab material belt 105 is ensured.

[0064] The embodiment of the application changes the length of the tab material belt 105 between the cutting knife and the winding station 201 before the tab material belt 105 is cut off by the cutting compensation assembly 4, compensates the tab material belt 105 with inconsistent winding lengths caused by factors such as tab thickness, diaphragm thickness, winding needle diameter, etc., so that the tab material belt 105 at the cutting knife is a cutting position meeting the length requirement, the lengths of the inner tab and the outer tab after cutting are consistent, and the quality of the battery cell of the double-battery-cell winding machine is improved; the tab driving assembly 6 of the inner tab guiding mechanism 1 is linked with the cutting compensation assembly 4 of the inner tab guiding mechanism 1 by the linkage cylinder 5, so that the inner tab is not torn during the compensation process, the wrinkling of the inner tab during the winding process is effectively avoided, and the quality of the battery cell is ensured; the guiding adsorption plate 85 is swung below the tab material belt 105 before the tab material belt 105 is cut off, the tail of the tab material belt 105 is adsorbed by the negative pressure, the tension of the tab material belt 105 is provided, the alignment of the tail of the tab material belt 105 is ensured, and the production yield and the quality of the battery cell are effectively improved.

[0065] The above is not intended to limit the technical scope of the application in any way, and any modification, equivalent change and modification made to the above embodiments according to the technical essence of the application still belong to the scope of the technical solution of the application.

Claims

1. A sheet feeding mechanism having a cut-off compensation assembly, characterized by, The cutting compensation assembly and the sheet driving assembly are sequentially arranged between the cutting knife and the winding station along the direction of the polar sheet strip, the sheet driving assembly transports the polar sheet to the winding needle of the winding station through the main driving roller, and the cutting compensation assembly comprises a compensation roller arranged on one side of the polar sheet strip, and the compensation roller pushes the polar sheet strip to the other side at a certain angle to change the length of the polar sheet strip between the cutting knife and the winding station when compensation is performed before the polar sheet strip is cut.

2. The sheet feeding mechanism having a cut-off compensation assembly according to claim 1, wherein, The fixed roller is arranged between the cutting compensation assembly and the cutting knife, a compensation station is formed between the fixed roller and the main driving roller, and the compensation roller moves relative to the fixed roller and the main driving roller to push the polar sheet strip between the fixed roller and the main driving roller when compensation is performed before the polar sheet strip is cut.

3. The sheet entry mechanism having a cut-off compensation assembly according to claim 2, wherein, When the polar sheet strip is not compensated, the polar sheet strip in the compensation station is straight, and when compensation is performed before the polar sheet is cut, the polar sheet strip in the compensation station is bent into a C shape.

4. The sheet entry mechanism having a cut-off compensation assembly according to claim 2, wherein, The fixed roller is mounted on one side of the first movable plate, the first movable plate is movably mounted below the connecting plate and connected with the cutting compensation assembly, a first guide rail is arranged between the first movable plate and the connecting plate, a downward pressing cylinder is arranged between the connecting plate and the first movable plate, and the downward pressing cylinder drives the first movable plate and the fixed roller to move along the first guide rail to press or release the polar sheet strip.

5. The sheet entry mechanism having a cut-off compensation assembly according to claim 4, wherein, The cutting compensation assembly comprises a compensation roller, a second movable plate, a second guide rail and a linear driving module, the compensation roller is mounted on one side of the second movable plate, the second movable plate is arranged in parallel on one side of the first movable plate, the second guide rail and the linear driving module are arranged in parallel between the second movable plate and the first movable plate, the second guide rail is parallel to the first guide rail, and the linear driving module drives the second movable plate and the compensation roller to move along the second guide rail.

6. The sheet entry mechanism having a cut-off compensation assembly according to claim 4, wherein, The sheet feeding mechanism is divided into an inner sheet feeding mechanism and an outer sheet feeding mechanism, the inner sheet feeding mechanism and the outer sheet feeding mechanism each comprise a fixed roller, a cutting compensation assembly and a sheet driving assembly, the inner sheet feeding mechanism and the outer sheet feeding mechanism synchronously transport the inner polar sheet and the outer polar sheet to the winding needle of the winding station, the inner sheet feeding mechanism and the outer sheet feeding mechanism are arranged on the support together, a third guide rail is arranged between the connecting plate of the inner sheet feeding mechanism and the support, the third guide rail is perpendicular to the first guide rail, the first movable plate of the inner sheet feeding mechanism is provided with a linkage cylinder in transmission connection with the sheet driving assembly of the inner sheet feeding mechanism, and the sheet driving assembly of the inner sheet feeding mechanism drives the fixed roller and the compensation roller of the inner sheet feeding mechanism to move along the third guide rail through the linkage cylinder; and the connecting plate of the outer sheet feeding mechanism is fixed to the support.

7. The sheet entry mechanism having a cut-off compensation assembly according to claim 6, wherein The linkage cylinder is vertically arranged below the first movable plate of the inner sheet feeding mechanism, a butt joint is arranged on the driving end of the linkage cylinder, and the butt joint cooperates with the deviation correcting plate of the sheet driving assembly of the inner sheet feeding mechanism.

8. The sheet entry mechanism having a cut-off compensation assembly according to claim 6, wherein The sheet feeding driving assembly comprises a main driving roller, a deviation rectifying plate, a deviation rectifying driving module and a sheet feeding driving member, the main driving roller and the sheet feeding driving member are arranged on the deviation rectifying plate, the sheet feeding driving member is in transmission connection with the main driving roller to drive the main driving roller to rotate, the deviation rectifying plate is provided with a fourth guide rail between the deviation rectifying plate and the support, the deviation rectifying driving module is arranged between the deviation rectifying plate and the support, and the deviation rectifying driving module drives the deviation rectifying plate and the main driving roller to move along the fourth guide rail.

9. The sheet entry mechanism having a cut-off compensation assembly according to claim 1, wherein, The sheet feeding guiding assembly is installed on the support and located below the outer sheet feeding mechanism, and comprises a fixing rod, a swing arm, a blowing rod and a sheet feeding guiding cylinder, the fixing rod and the sheet feeding guiding cylinder are connected with the support, the swing arm is connected with the fixing rod and in transmission connection with the sheet feeding guiding cylinder, the blowing rod connected with an external air source is installed on the swing arm, the sheet feeding guiding cylinder drives the swing arm and the blowing rod to swing with the fixing rod as the center, and a detection assembly is arranged on the swing arm to detect the position of the sheet material and the number of tabs.

10. The sheet entry mechanism having a cut-off compensation assembly according to claim 9, wherein, The swing arm is provided with a guiding adsorption plate, the guiding adsorption plate is provided with a gas hole connected with an external air source, and the gas hole forms a negative pressure for adsorbing the sheet through the external air source.

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